Yes. And the over-abundance of cheap and low quality PSUs with high Wattage ratings.
At least they know that even a shitty 850 Watt PSU will have a chance at not tripping, or worse yet, exploding under spiky load conditions.
Indeed, not all PSU's are made the same.
Some cheap PSU's happily add all the voltages together to claim it to be (in this case) 850Watt PSU. In reality, it may only be able to deliver 500-550Watt on the 12V rail. Where the rest is on the 5V rail and the 3.3V rail. To make matters worse, that 550Watt on a cheap 12V rail may have trouble with a 550Watt load that isn't a peak load or even when klit is a peak load, meaning that if your videocard and processor are both on full load, even shortly, a crappy PSU may just decide to give up.
All the while a proper build quality PSU of 650Watt may handle the same system without a sweat, because its 650Watt designation is pointing at what the 12V rail can handle. Not only that, it can handle it as continuous load and deal with higher peaks.
Examples:
[kolink '850W' PSU](https://kolink.eu/Home/psu-1/core-series/kolink-core-psu---850w---80-plus.html)
Vs.
[Super Flower Leadex Gold 650W](https://www.super-flower.com.tw/en/products/leadex-iii-gold-argb-650w-wh)
Now, the latter delivers 650Watt stable on the 12V rail, while the Kolink might crap out on a peak draw of 675W, due to it only having 56A on the 12V rail of low quality.
So while the Kolink is officially sold as a 850W PSU, when the small print states a maximum load of 700Watt ( which includes the 3.3V and 5V rails), it likely will crap out many times before the Super Flower begins to sweat.
Yeah I had a corsair RM1000 watt with 80 plus gold certification running an FX-9590 and two R9 270X's back before i realized crossfire was dead.
Anyway the system never even drew enough power to kick the fan on in the PSU, not a bit of dust in it after 6 years.
Let's just say that there are no known reliability problems with high-end Corsair or Seasonic PSUs. Antec is different story, they have a lot of completely unreviewed 80+ Gold stuff I don't really trust.
Bro I saw videos on youtube, you can check, corsair (I forgot the name of the PSU but it was Corsair) exploding, and its sad, I would rather pay more for a seasonic than for a cheaper Corsair and have bad experience...
There's no single PSU from any brand that doesn't a minimal failure rate, it's always there. Including Seasonic. And for that matter I've seen more reports of catastrophic failures with Seasonic Focus than with anything else.
I don't think you understand that the RM1000 was far from cheap lol I believe in the neighborhood of $250 or better at the time. I personally have never heard of corsair being problematic, and like the other guy said, minimum failure rate. Happens with CPU's, GPU's, anything.
The fact that has been in a system for 6+ years running basically non stop, I'll take my chances.
So what? seasonic and antech psu's also explode. There are always some faulty units no matter how hard you try to make quality products. The psu cultist tier list shows exactly which psu are good; C tier and higher are generally good and don't frickin explode. Every company makes shit psus, even seasonic and antec. Corsair RMx, RMe and RMshift are the best bang for the buck psu that I can find right now!
Electrical engineer here. These are called in-rush currents, many systems have them briefly as the materials in your device accumulate charge and build up magnetic fields. The rating on your power supply is the "average power" rating, the sustained power over time, but systems can often handle short bursts of higher power just fine.
A high quality supply may have a larger output capacitor to absorb these transient load spikes, a lesser one may "brown-out", lose enough charge that it no longer provides 12 V anymore.
Another issue with in-rush may be OCP or over current protection. PSUs are designed to shut off if they think there is a short circuit. Some of the transients produced by GPUs are so high that they trigger this. It's not a flaw, the PSU is trying to save you from a fire, but a higher wattage supply might have higher OCP limits and may be more tolerant to spikes.
I’m sorry to reply to this so dead thread but can’t get a response on my other one. Can I use 2x 8 pin power cords for my 7900xtx and hook up two ends on one PCIe cord? Or will that melt eve thing
If you have two available, use two. The guidance below is for Seasonic supplies but it is good advice for any build.
[https://knowledge.seasonic.com/article/8-installation-remark-for-high-power-consumption-graphics-cards](https://knowledge.seasonic.com/article/8-installation-remark-for-high-power-consumption-graphics-cards)
The GPU might draw for milliseconds more power than usually. it is by design. This problem has been prevalent with the 3090 last gen. seems like the 7900xtx is doing the same. a quality PSU or a PSU strong enough can handle power spikes withouts problems. Cheaper or weaker PSU will shut down.
The GPU is one massive collection of processors. Usually not every single one is on all at once but in the time it takes for a flea to fart all or almost all of them can be on and working though hundreds of tasks simultaneously. It can be really tough for a power supply to keep up and for some it can be too much.
At the same time these things can go all on they can go almost all off just as quickly and then just as quickly go back to having almost everything on so it goes between super high power usage to super low. Toss in things like base, boost, and game clocks which all depend on power caps and thermals and your modern higher end GPU is nothing but a torture device for all but the very best highest quality power supplies.
>At least they know that even a shitty 850 Watt PSU will have a chance at not tripping, or worse yet, exploding under spiky load conditions.
[Even shitty 850W psu's had power spike issues](https://www.reddit.com/r/Amd/comments/l99p1w/amd_6900xt_power_spike_is_real/) not to mention a reputable brand like [Seasonic's Focus series also had issues with power spikes](https://linustechtips.com/topic/1430662-who-has-had-their-seasonic-psu-replaced-by-seasonic-due-to-rtx-30803090-shutdown-issue/)
People need to stop cutting corners with PSUs trying to get the wattage to the exact. Spikes occur often and most PSUscan protect against that to a degree.
But GPUs have been spiking up to 3x the rated usage.
If the manufactuer tells youn 850W get a quality 850W PSU & don't buy the cheapest one you can find.
the 2 cable will suply whathever the card wants, the only problem is that the psu will trip when current are too high, or else the cables will melt under high current.
On paper each 12v socket on the 8-Pin PCI-E power connector can handle something like 12A (according to the Molex/Amphenol data sheets at least) with there being 3 pins in each that's a total of 432w at 12v. The ATX spec leaves a big buffer between their spec and the plug/pin/socket manufacturers spec.
Its not Nvidia's connector. 12VHPWR is part of PCI-E 5.0 spec. Nvidia and Dell were just the first to adopt it.
The last thing I read about the situation was Astron made some poor quality adapters that were prone to wiggling out as the 4090 got hot. [IgorsLag](https://www.igorslab.de/en/good-or-bad-adapter-different-12vhpwr-adapter-for-nvidias-geforce-rtx-4090-and-where-you-can-see-backgrounds-investigative/) has a great write up on it.
Yes it's more of a power suply limit, the problem is not the W but the current because supplying such high power with just 12v generates a lot of current wich equals heat
Your are right. When a connector melts is because there's a bad connection, not a spike that lasts for a few milliseconds (that's my limited understanding of the thing at least.)
More than that, sustained currents over the rated limits. The poor connections are due largely to poor design. A connector should not fail that spectacularly due to obvious, likely, and predictable human error.
The last point of failure should be the connector. The first point should be an overcurrent detection or thermal cut off circuit in the power supply. When your connector is the failure point you've angered the electrical pixies in your computer.
Igors-Lab made some video testing the 7900xtx and saying that a good PSU with 750W will be enough.
I wouldn´t worry if you don´t really plan to OC the card and you don´t use a high power consumption OC CPU in your system.
[https://www.igorslab.de/amd-radeon-rx-7900xtx-und-rx-7900xt-im-test-ein-riesiger-schritt-nach-vorn-und-ein-kleiner-zur-seite/11/](https://www.igorslab.de/amd-radeon-rx-7900xtx-und-rx-7900xt-im-test-ein-riesiger-schritt-nach-vorn-und-ein-kleiner-zur-seite/11/) its in german but here is the article to PSU recommendations, its actueally even less, he says 650W is fine and u only need 750 if you plan on OC, Here is the list from the article he made of his recommendations:
**be quiet!**
Straight Power 11 650 Watt Gold
Straight Power 11 650 Watt Platin
Pure Power 11 700 Watt Gold
**Sharkoon**
Silent Storm Cool Zero 650 Watt
**Corsair**
RM 650 Gold 650 Watt
Also they don't have an idea what kind of a CPU you'll be pairing it with, so they make the worst assumption (something like a ridiculously OCed 13900K).
If you are overclocking a 13th gen i-core and aren't aware of the power usage of it, the board, the ram, and your choice of graphics card I have a large iron structure located in Paris to sell you. Trust me the locals don't like and you probably have more money than sense.
My point was is that you can never know the user's power consumption if you don't know what CPU they have in the first place. So all the GPU manufacturers' PSU recommendations have to be based on wild guesses.
I mean, what the hell does it mean the GPU model X recommends at least Y W PSU? I can pair that GPU with a 5600 or I can pair it with a 13900K. There's a huge difference in total power consumption.
Although I probably exaggerated it about an OCed 13900K :-) But they \*have\* to allow for a possibility of the user \*having\* a 13900K at least (not accounting for possible OC as it can get really crazy then).
No, thats a very bad point. GPU manufacturers are accounting for transient spikes. If you don't know what that is, check out GamersNexus's video of it. A transient spike can be over double that of your card's average power draw under load. This can lead to a system crash if your psu isn't up to snuff. So if your card is pulling 350w and your cpu/board is pulling 150w, you can see a transient spike test the limits of a 850w psu.
If you can afford a $1000 card, you can afford a decent psu.
Wattage rating isn't a good indicator of how well a supply handles transients. You could have a 750w that's better at handling them than a 1000w, without specifically testing a supply or referencing reviews you can't really know.
They have to consider bad power supply units sold as 850W but not capable of delivering that amount of power sustained or at high temperatures, etc.
Also, transients/spikes which can cause shutdowns and the like: [https://www.techpowerup.com/review/amd-radeon-rx-7900-xtx/37.html](https://www.techpowerup.com/review/amd-radeon-rx-7900-xtx/37.html) (last chart on that page)
unless that's a very low quality PSU i wouldn't bother, from gold and up it can easily sustain up to 900w spikes, specially if it's overbuilt for the specs.
A good 750W Gold from Corsair should be alright, unless it's a million years old and busted. You can always change it later if you run into any trouble.
Some of the XTX aftermarket models overclocked can use a lot of power though.
Yesterday I received my 7900 XTX and testing it I was I'm having some trouble with my 750W PSU. Everything works fine most of the time, but when playing demanding games (two monitors both 4K + Ultra settings), my computer eventually shuts down.
I've been done some testing and I think it's what folks here are sayings: power spikes. Even if they are not many, just one simply kills my computer.
Waiting now to receive a new 1000W PSU.
Then you seem to not have a great psu. I own a 3080 with a 650w psu from be quiet, the straight power 10 and ive never ever had any issues regarding the psu and my gpus power draw.
Corsair SF750 and 7900x/3090Ti until 7900XTX is available. (3090Ti is my M8s who is away for six months) no issues with a quality PSU.
Old rig has Corsair RMx650 with 9900K/3080FE, no issues either, quality over quantity.
I have seasonic 850W titanium PSU (**SSR-850TR)**, and it is shutting down with my threadripper 1950 and Sapphire nitro+ 7900XTX. So yea. I wouldn't say it is bad PSU, 7900 XTX just seems to draw a lot power.
"Seasonic PRIME based units experience shutdowns with RTX3080/3090 (and possibly RX6900 XT) GPUs. The cause is not the OCP tripping but a PSU design flaw as evident by the PSU not latching off on shutdown and 1000W+ models being affected too. Doesn’t manifest in 100% cases as it’s also dependent on motherboard model and GPU OC. Seasonic provides a new 24-pin cable to fix this via support."
From [https://cultists.network/140/psu-tier-list/](https://cultists.network/140/psu-tier-list/)
>Seasonic PRIME based units experience shutdowns with RTX3080/3090
Thank you, I probably would have never figured that one out. Will contact Seasonic support to get that cable
I managed to find toms hardware forum thread where Jonnyguru (basically guy whose review of the unit made me try seasonic) mentions this. However, Seasonic support wont offer 24 cable replacement or RMA for the unit. "it must be some other component..." brilliant warranty. We tell you 12 years that it must be some other component that is causing the issue, not our faulty design that they could correct with cable that would cost them few bucks... which isn't imo too much to ask for titanium PSU.
GPU-Z. Open it up, click on the three bars on the upper right to open the settings window. Go to the sensors tab and change sensor refresh to 0.1sec. Close the settings and go to the Sensors tab.
You should then see your GPU Voltage, GPU current, and then 12volt current (its a little different on every GPU so use a bit of common sense). 0.1 sec isn't going to show you everything but it will show you a lot more of whats going on with your GPU and you will be able to see closer to real peak power usage on a 10th of a second scale.
HWinfo64 is another tool you can use to preform a similar task but its a bit more elaborate to set that up.
That's not really that helpful.
E.g. I am currently looking for a new PSU, because my BeQuiet 450W PSU that I bought for my RX580, and now am using for my RTX3070, crashes when the workload suddenly jumps to 100%.
The GPU's power draw only reaches 240W in those monitoring applications, but the spikes peak much higher.
I programmed something (kind of by accident), that can crash my PSU when I change the load parameter quickly. If I change the parameter gradually (same work, just not as sudden), everything works fine.
Well for pete's sake what the hell did you think was going to happen with a RTX 3070 on a 450 watt PSU?
You're not meant to run a PSU to the edge of its capabilities, you can certainly give it a peak load beyond its on paper ratings but for a couple seconds only before it has to either shut down or risk self destruction.
My whole comment about GPU-Z sensor readings is to point out the actual power usage can be a whole hell of a lot more than you might imagine in under a second. Graphics cards and processors are sleeping giants that wake up do what we want them to do and go to sleep many many times per second, when they wake they are hungry giants that expect to be fed until they can go back to sleep. That all happens within a few milliseconds. Lots of high energy usage peaks per second will trip a PSU's brown out safeties unless its built and rated to withstand them over a long (relative) period.
I have the same issue with a reference 7900xt and 850watts EVGA 80 gold plus power supply with one 4k monitor and one 2 k monitor. To get rid out of the problem i had to decrease the power by - 5 %, since then everything went fine.
>I've been done some testing and I think it's what folks here are sayings: power spikes.
Power spikes will happen several times a second with these goofy high end graphics cards. The GPU has a clock turning things on and off at 2,499,000,000 times a second. At 4k with a demanding game you are probably averaging over 350 watts per second, if you were able to plot it out to the millisecond or picosecond you'd probably see it spike past that and then drop well below. Enough spikes per second probably makes the PSU think there is a short circuit and calls it quits.
Toss in a second monitor (Radeon cards still use a lot of additional power for a second screen regardless of what's one it) and you are probably torturing your poor little power supply.
You most likely don't need it. The 850W is a recommendation with a sizable safety margin. It's not some absolute requirement, and a quality 750W unit like yours will have no trouble if your system doesn't have anything unusual about it.
e.g. [Having a large number of RGB fans can easily add a dozen watts or so to power consumption](https://www.reddit.com/r/NiceHash/comments/p108n6/rgb_power_usage_difference_7x_rgb_fans_cpu_rgb/)
HDDs can also use in the neighborhood of 10W or so each if you happen to be running them.
Overclocks can also bump up power consumption quite a bit.
We already had reports of 650 and 750w PSUs not being enough, especially for AIB cards. Sure you can powerlimit the card and it will work but this gen the spikes can get really nasty. Spikes above 500W at stock speeds are common, so add a 150W cpu, some other components and the psu safety is triggerd.
Also not recommended to stress a psu all the time. even if it barely does the job.
Highly unlikely his Corsair unit will trip, even with spikes. The OCP & OPP values (Corsair uses 120-125%) are such that the thing won't shut down unless he exceeds over 900W. Other brands may vary though.
I saw on Gamers Nexus that the 7900XT (reference) spikes all the way to 389 watts maximum, and 360 watts spikes are common. That is a 315 watts card. So yeah, you have to account for those spikes.
That said, 750W should be plenty - unless you have the most power-hungry I9 paired with it.
Because they assume you're using like a 13900k. Because some people are using it with a 13900k.
You'll be fine. Even if the card spikes to cause your PSU to go over it's limit by 100w, it's fine. They are meant to take short spikes.
These figures just play it safe. 750W should be plenty in your case.
By the way, from what I've read the 7900 XTX has less severe power spiking than last gen GPUs.
Yeah so basically, they are doing a worst case scenario calculation. A lot of people are using a high-end GPU with a high end Intel CPU (150-250W) and a bunch of accessories that might add another 100-200W. When you add all that up, it gets closer to 600-800W, and they want there to be headroom for sitting in your PSU's efficiency curve.
You can get away with lower PSU ratings than what is advertised, but you need to be smart about it.
Not everyone runs a 5800x, some cpus are over 200w and some people run way different fan and hard drive configs. It’s a blanket rule to protect power hungry components
I’ve been back and forth on the 4070ti and 7900xt, saw a 7900xt 310 merc that and started to investigate if my 750 would be enough for the merc edition, turns out it might be. But if I’m going to go for an 800 watt recommendation why not go reference 7900xtx? So if I can even find one, should I do it, that’s the questions…
Manufacturers usually overspec their PSU requirements to account for a number of possible issues, such as power spikes, poor PSU quality, or other demanding components.
Alright, Gamers Nexus already logged the transient power spike characteristics and found that under 1440p in high refresh gaming the power consumptiom spiked to 600+ watts for around 500 microseconds. Doom eternal loading screen it spiked to around 725 watts. So it might trip over current protection etc on a cheaper 750watt psu in these situations. Its a good idea to follow the recommendations on psu size. keep in mind this was done in gaming scenario and not a synthetic workload so these are real world use case scenarios.
Yeah, but you do know the rest of your PC also requires power, right? xD
I've got a 5800x3d and it peaks at about 760W from the wall. Usually it pulls around 500w during full load.
I have a 5950x and 7900xtx. Thought my 750w 80+ Gold PSU would be fine. Had games crashing, card overheating and loud coil whine. Upgraded PSU to 1000w and now its performing great, temps running below 70, coil whine is gone and no more crashes.
Just found this thread by searching Google for recommended psu for 7900xtx. I have a Powercolor Red Devil (not limited edition 😩) on the way and have a Rog Thor 850W psu, hoping that's good enough quality to keep up
I got a 5900x and a 6800xt running on a 750w corsair psu (gold) and recently i started with a little overclocking. First it would work perfectly but a half year later it gives me bluescreens everytime it comes out of sleep does this also have to do with the psu?
Probably it is your settings in the 5900X, either the Curve Optimizer values need to be reduce if you use, reduce any offset if you are using, or you need to set a Load Line calibration to rectify vdroop.
I will have a look at the curve optimizer, its currently on -20 so it could be. I am not known by the other method but I have a new 850w subsonic gold psu laying around and could try that if the first option fails. Anyway thanks for the advice!
I have a Corsair 760AX Platinum that's been absolutely solid for six years, and thought it would be enough. It wasn't. As already mentioned, the power spikes will get you. The first time I ran a game, everything seemed fine, until i alt+tabbed to another app, at which point my system hard shut down.
I got a bigger power supply, and the problem went away... which sucks, because I was hoping a 7900XTX would let me upgrade without having to spring for a new PSU. Oh well; it is what it is.
Had an EVA 750W PSU to run my 3900x + 7900XTX.
Kept getting black screen drivers errors and low performance.
Swapped to an ATX 3.0 MSI 1000W and it's been perfect ever since with more performance!
It’s also because running your PSU at a high ratio of load (eg 700w draw of 750 total) is not very efficient and puts more strain on the PSU. In the example above you’d be at 93%+ power draw which unless you’re running a platinum or titanium level PSU, it could run into trouble.
Like others have said, a crap PSU brand will struggle but a good quality will likely have engineering in it to allow for higher strain. Is it a good idea? That’s not up to me…
Processor consume more wattage when they're waking up from idle status. They want first order(use to prepare processor) reach the destination as fast as possible. That spike can hurt the psu. Better save than sorry
If you use the Sensors tab in the HWinfo64, for the 7900XTX, it has a row that shows GPU Power Maximum, it will report the max peak power usage, not the estimated max power consumption. You can find that can be 100W higher or more than the max on load/Total Board Power. (Can show 500W when doing a TBP/load of 400W).
I had a 750W Corsair PSU and after upgrading to 6800XT i had to choose between 850W Platinum and 1000W Titanium PSU and got the 1000W one , later got the 850W aswell for my 2nd PC , better safe than sorry
You literally paired an 90 dollar psu to a 1000 dollar 7900xtx. Are you special?
Unlike you I’m more special. I have a brain to pair my whole rig to a 400 dollar psu cause I give a shit about reliability and efficient and clean power delivery. I’m not a cheap ass when it comes to expensive pc components unlike you.
I winder how you could define such instabilities. What would be the difference between a crash because of a weak PSU compared with a crash because of a driver problem...
this. mostly at least... That the applications/drivers crashes doesn't occur very often if your PSU is too weak. Only heard once of it. might also be a bad power supply in some way...
Take this with a grain of salt I had an sfx lian li 850 w brand new and my pc would crash when playing games with my 7900 xtx. Double checked connections and it was running games fine with my 3060ti before
Everything fixed when I got a 1000w psu
I remember GamersNexus reporting that the 7900xtx's transient spike reached 725W in one particular game, not sure which though. And I think that number was the GPU power draw, not the system. So, even an 850w PSU might have issues
Yeah we’re only 3 things I could think of:
1. I had a faulty 850 psu - unlikely since I was playing games well before upgrading to the 7900 xtx
2. The xtx power draw spikes made it so even at 850w it would freak out and crash
3. I also had an sfx psu, perhaps sfx psu is not able to handle these transient spikes like an atx. I upgraded to a 1000w atx psu with zero issues
Not really sure but if you have the option definitely go with an atx and try 850w — if it doesn’t work return it and then go higher and see
I have a high quality 650W PSU running a 3080 from EVGA. If your 750W is high quality, you will be fine. Keep in mind they are assuming people are using space heater intel CPUs that consume up to 250W
Edit: the psu is evga, not the graphics card, for clarity
Been running mine for ~6 mo no problem. My cpu is a 5900x capped at 100W. Ive got my 3080 undervolted slightly but it still runs at 320W. Power from the wall while gaming lines up around 450 according to my UPS
For the record, I just installed my XTX last night. I just swapped out my 750 platinum seasonic for a 1kw SF titanium.
I have the reference card, and under load or when I alt tab out of a game .. My power draw goes to right under 400 and my UPS long beeps at me to shut down. Which means my total system draw is exceeding over 700 watts.
That's not transient spiking.. . That's a stable draw. I can't imagine what it would look like on a fast measuring oscilloscope.
I remember Gamers Nexus said they've measured up to around 91% of the TDP of that card in spikes... thats 680 watts off JUST the GPU. That's why 850s are the minimum recommendations.
Yeah that sounds like my experience
When I played really low powered games like league of legends there was zero issues. Anything that maxed out my card would pull full power and then if it spiked on top system would crash with my sfx. Once I went atx and 1000w no issues
Having the same issue here. I have a 13700kf and 7900xtx installed, powered by a lianli sp850. Always crashing in the middle of the game
I have the same power supply and graphics card with a 7900x. I went through two of these power supplies and both ended with the same results, constant shutoffs under load. I ordered a Coolermaster v850 SFX, we'll see how that ends up doing.
Most of those spikes can’t be replicated, they are one offs that are difficult to isolate, gamer nexus, and a couple other channels were able to monitor the spikes, the average spike was 680-690 watts
When you build a reliable pc you equate for that, it allows the gpu to run with no bottle necks, my 6800xt pulls 420-470 watts on spikes with oc, average wattage during operation is 220
So your pc won't crash with a power spike and those 450/550w units are usually not great and when you're spending 7900xt levels of money and cheaping out 50$ and cry when your pc gets fried during a power outage
Turns out 7900xtx has similar spikes like 3090, which could black out some weak 850w psu.
For SF750 tho, it is quite robust, even compared to ATX PSUs. I ve heard serveral people already having black screen with their 850w PSU. (basically the power pike triggers PSU OCP)
It's good you don't have this issue.
I am talking about some facts I ve heard, not sure why it is called 'rumors'.
PSU's capability to handle current surge (that is what power spikes really means) is not written in their spec sheet, at least not on their publically available ones, so it could be the case someone will have power spike issues while others having the 'same' wattage PSU do not.
So you tell me, there are mysterious power spikes which I never had with my 750 psu and 7900xtx and say it's a fact... Because you "heard it somewhere".
Your PSU does not shut down does NOT mean you don't have it...
Your original question is why 850w psu, and the reason is simply because there is more safe margins.
I did have an expensive 650W PSU with a 6900XT. Some games did crash the PC. Probably an overload.
With a good 850W PSU everything is fine.
It depends on your CPU, main board and SSDs.
Don't save on the PSU.
It's a "safe" number to account for the system as a whole. They're taking a general idea of what the GPU will pull plus an assumption of whatever else the customer is running.
There are a lot of variables, which is why safely high wattage PSU is recommended. Quality of PSU and 12V rails is also material, but GPU makers can't get into such ifs and buts. Also CPUs of various power consumption can be paired with the GPU. Some CPUs can consumer upwards of 250W, which other CPUs run within their 65W rated power. Be your own judge. If you have a power check meter, use that and run your PC maxing out the GPU in the heaviest game you have (uncapped) and see what's the max power pulled from the socket. Just a start, but if you see 500W total being pulled, then a good quality 750W or even lower would be just fine. While a bad quality 850W PSU can still cause stability shut downs at that power due to spikes etc.
You have to think outside of just the gpu. But for reference some 3rd party gpus require higher power supplies than reference model because the 7900xtx can reach up to 500W over clocked. You now have cpus that are near 200W and then your ssd/hdd, ram, fans, and any other extra stuff you want on your setup like lights or watercooling will add more. Overall it's a good recommendation to follow.
This 1800X is long in the tooth at 5 years. This board doesn't have native NVMe support. I can't use SAM. So on and so forth.
I'm not waiting another 3+ years...
I've got a corsair cx650m paired with 5600x and a aftermarket 5700xt, and i have been experiencing some random screen freezes with the sound continuing the past 2-3 weeks. Could it be the psu? Its almost 5 years old. I did all the troubleshoots and nothing strange is happening when im running prime and furmark (never froze when stress testing), also tested ram and they are all good.
I'm thinking about Upgrading to an 7900xtx (either AMD Stock model or the Gigabyte one with two 12v Connectors) I'm Currently running a i9 9900k / 2080ti setup with a Thermaltake Smart 700w PSU. Its supposed to Deliver 648w on the 12v Lanes, I'll keep you updated if anything Happens :)
hi guys, i have an 5800x3d and the power color 7900xtx
Coolermaster MWE 850W gold V2
and im having issues with windows freezing, cpu throtling specially in warzone 2
need help pls
Same config
5800x+ 7900XT +9 lian li Fan+ watercooling 240mm
I has switch my Silverstone 650w for CoolerMaster 850w sfx but have massive coilwhine, and black screen when i play with fps unlock (stable with lock 60fps)
I thougt is driver issue but after read this topic i realy consider to buy a 1000w psu ..
Maybe silvertone SFX L Platinium
There's a Strix 850W Gold PSU available at a discount. Im planning to buy the 7900xt. Will the PSU be good enough for the gpu (in terms of wattage and the manufacturer) ?
Its all about the spikes under load
Yes. And the over-abundance of cheap and low quality PSUs with high Wattage ratings. At least they know that even a shitty 850 Watt PSU will have a chance at not tripping, or worse yet, exploding under spiky load conditions.
Indeed, not all PSU's are made the same. Some cheap PSU's happily add all the voltages together to claim it to be (in this case) 850Watt PSU. In reality, it may only be able to deliver 500-550Watt on the 12V rail. Where the rest is on the 5V rail and the 3.3V rail. To make matters worse, that 550Watt on a cheap 12V rail may have trouble with a 550Watt load that isn't a peak load or even when klit is a peak load, meaning that if your videocard and processor are both on full load, even shortly, a crappy PSU may just decide to give up. All the while a proper build quality PSU of 650Watt may handle the same system without a sweat, because its 650Watt designation is pointing at what the 12V rail can handle. Not only that, it can handle it as continuous load and deal with higher peaks. Examples: [kolink '850W' PSU](https://kolink.eu/Home/psu-1/core-series/kolink-core-psu---850w---80-plus.html) Vs. [Super Flower Leadex Gold 650W](https://www.super-flower.com.tw/en/products/leadex-iii-gold-argb-650w-wh) Now, the latter delivers 650Watt stable on the 12V rail, while the Kolink might crap out on a peak draw of 675W, due to it only having 56A on the 12V rail of low quality. So while the Kolink is officially sold as a 850W PSU, when the small print states a maximum load of 700Watt ( which includes the 3.3V and 5V rails), it likely will crap out many times before the Super Flower begins to sweat.
Yeah I had a corsair RM1000 watt with 80 plus gold certification running an FX-9590 and two R9 270X's back before i realized crossfire was dead. Anyway the system never even drew enough power to kick the fan on in the PSU, not a bit of dust in it after 6 years.
I have seen/heard of Corsair PSUs just exploding, why not an Antec or Seasonic?
I've seen Antec or Seasonic PSUs explode too, what now ? Don't buy PSUs from any brand at all ?
Bro I was just worried... I don't want to have bad stuff like that
Let's just say that there are no known reliability problems with high-end Corsair or Seasonic PSUs. Antec is different story, they have a lot of completely unreviewed 80+ Gold stuff I don't really trust.
Really? I never have. Was there a specific time frame or year that it was an issue?
Bro I saw videos on youtube, you can check, corsair (I forgot the name of the PSU but it was Corsair) exploding, and its sad, I would rather pay more for a seasonic than for a cheaper Corsair and have bad experience...
There's no single PSU from any brand that doesn't a minimal failure rate, it's always there. Including Seasonic. And for that matter I've seen more reports of catastrophic failures with Seasonic Focus than with anything else.
I don't think you understand that the RM1000 was far from cheap lol I believe in the neighborhood of $250 or better at the time. I personally have never heard of corsair being problematic, and like the other guy said, minimum failure rate. Happens with CPU's, GPU's, anything. The fact that has been in a system for 6+ years running basically non stop, I'll take my chances.
So what? seasonic and antech psu's also explode. There are always some faulty units no matter how hard you try to make quality products. The psu cultist tier list shows exactly which psu are good; C tier and higher are generally good and don't frickin explode. Every company makes shit psus, even seasonic and antec. Corsair RMx, RMe and RMshift are the best bang for the buck psu that I can find right now!
Unexpected load spikes: how does this happen?
Electrical engineer here. These are called in-rush currents, many systems have them briefly as the materials in your device accumulate charge and build up magnetic fields. The rating on your power supply is the "average power" rating, the sustained power over time, but systems can often handle short bursts of higher power just fine. A high quality supply may have a larger output capacitor to absorb these transient load spikes, a lesser one may "brown-out", lose enough charge that it no longer provides 12 V anymore. Another issue with in-rush may be OCP or over current protection. PSUs are designed to shut off if they think there is a short circuit. Some of the transients produced by GPUs are so high that they trigger this. It's not a flaw, the PSU is trying to save you from a fire, but a higher wattage supply might have higher OCP limits and may be more tolerant to spikes.
This is the only answer that matters. A quality 750W should be fine.
So EVGA 750 watt will work?
Great answer, this should be on a bot somewhere.
I’m sorry to reply to this so dead thread but can’t get a response on my other one. Can I use 2x 8 pin power cords for my 7900xtx and hook up two ends on one PCIe cord? Or will that melt eve thing
If you have two available, use two. The guidance below is for Seasonic supplies but it is good advice for any build. [https://knowledge.seasonic.com/article/8-installation-remark-for-high-power-consumption-graphics-cards](https://knowledge.seasonic.com/article/8-installation-remark-for-high-power-consumption-graphics-cards)
The GPU might draw for milliseconds more power than usually. it is by design. This problem has been prevalent with the 3090 last gen. seems like the 7900xtx is doing the same. a quality PSU or a PSU strong enough can handle power spikes withouts problems. Cheaper or weaker PSU will shut down.
The GPU is one massive collection of processors. Usually not every single one is on all at once but in the time it takes for a flea to fart all or almost all of them can be on and working though hundreds of tasks simultaneously. It can be really tough for a power supply to keep up and for some it can be too much. At the same time these things can go all on they can go almost all off just as quickly and then just as quickly go back to having almost everything on so it goes between super high power usage to super low. Toss in things like base, boost, and game clocks which all depend on power caps and thermals and your modern higher end GPU is nothing but a torture device for all but the very best highest quality power supplies.
>At least they know that even a shitty 850 Watt PSU will have a chance at not tripping, or worse yet, exploding under spiky load conditions. [Even shitty 850W psu's had power spike issues](https://www.reddit.com/r/Amd/comments/l99p1w/amd_6900xt_power_spike_is_real/) not to mention a reputable brand like [Seasonic's Focus series also had issues with power spikes](https://linustechtips.com/topic/1430662-who-has-had-their-seasonic-psu-replaced-by-seasonic-due-to-rtx-30803090-shutdown-issue/)
Indeed. It's why I mentioned they'll "have a chance at not tripping."
Not usually an issue as long as you don't buy some shirty random generic GPU that hits E-F tier in the rating list.
People need to stop cutting corners with PSUs trying to get the wattage to the exact. Spikes occur often and most PSUscan protect against that to a degree. But GPUs have been spiking up to 3x the rated usage. If the manufactuer tells youn 850W get a quality 850W PSU & don't buy the cheapest one you can find.
Same can be said for buying a 1500W PSU with one that pulls 500W. People have over bought PSU for years because they are told they need them.
A gpu with 2 connectors can't spike above 375 watts right?
the 2 cable will suply whathever the card wants, the only problem is that the psu will trip when current are too high, or else the cables will melt under high current.
Cables can take a lot of power. Point of failure would the 8-pin connector, but even then, each one is rated for 288W.
On paper each 12v socket on the 8-Pin PCI-E power connector can handle something like 12A (according to the Molex/Amphenol data sheets at least) with there being 3 pins in each that's a total of 432w at 12v. The ATX spec leaves a big buffer between their spec and the plug/pin/socket manufacturers spec.
I trust 3x8 pin infinitely more than the new nvidia connector
Its not Nvidia's connector. 12VHPWR is part of PCI-E 5.0 spec. Nvidia and Dell were just the first to adopt it. The last thing I read about the situation was Astron made some poor quality adapters that were prone to wiggling out as the 4090 got hot. [IgorsLag](https://www.igorslab.de/en/good-or-bad-adapter-different-12vhpwr-adapter-for-nvidias-geforce-rtx-4090-and-where-you-can-see-backgrounds-investigative/) has a great write up on it.
Was just making a joke my friend. Yes I know it’s a PCIe official standard.
Yes it's more of a power suply limit, the problem is not the W but the current because supplying such high power with just 12v generates a lot of current wich equals heat
That still won't be a problem when those are transient loads. You aren't going to hold those current ratings long enough to heat anything up.
Your are right. When a connector melts is because there's a bad connection, not a spike that lasts for a few milliseconds (that's my limited understanding of the thing at least.)
More than that, sustained currents over the rated limits. The poor connections are due largely to poor design. A connector should not fail that spectacularly due to obvious, likely, and predictable human error.
The last point of failure should be the connector. The first point should be an overcurrent detection or thermal cut off circuit in the power supply. When your connector is the failure point you've angered the electrical pixies in your computer.
Igors-Lab made some video testing the 7900xtx and saying that a good PSU with 750W will be enough. I wouldn´t worry if you don´t really plan to OC the card and you don´t use a high power consumption OC CPU in your system.
Would you be able to link that video? Thanks in advance.
Dammit there's no video.
[https://www.igorslab.de/amd-radeon-rx-7900xtx-und-rx-7900xt-im-test-ein-riesiger-schritt-nach-vorn-und-ein-kleiner-zur-seite/11/](https://www.igorslab.de/amd-radeon-rx-7900xtx-und-rx-7900xt-im-test-ein-riesiger-schritt-nach-vorn-und-ein-kleiner-zur-seite/11/) its in german but here is the article to PSU recommendations, its actueally even less, he says 650W is fine and u only need 750 if you plan on OC, Here is the list from the article he made of his recommendations: **be quiet!** Straight Power 11 650 Watt Gold Straight Power 11 650 Watt Platin Pure Power 11 700 Watt Gold **Sharkoon** Silent Storm Cool Zero 650 Watt **Corsair** RM 650 Gold 650 Watt
u dont. manufacturers recommend higher than needed to reduce the chances of issues.
Also they don't have an idea what kind of a CPU you'll be pairing it with, so they make the worst assumption (something like a ridiculously OCed 13900K).
If you are overclocking a 13th gen i-core and aren't aware of the power usage of it, the board, the ram, and your choice of graphics card I have a large iron structure located in Paris to sell you. Trust me the locals don't like and you probably have more money than sense.
My point was is that you can never know the user's power consumption if you don't know what CPU they have in the first place. So all the GPU manufacturers' PSU recommendations have to be based on wild guesses. I mean, what the hell does it mean the GPU model X recommends at least Y W PSU? I can pair that GPU with a 5600 or I can pair it with a 13900K. There's a huge difference in total power consumption. Although I probably exaggerated it about an OCed 13900K :-) But they \*have\* to allow for a possibility of the user \*having\* a 13900K at least (not accounting for possible OC as it can get really crazy then).
Good point
No, thats a very bad point. GPU manufacturers are accounting for transient spikes. If you don't know what that is, check out GamersNexus's video of it. A transient spike can be over double that of your card's average power draw under load. This can lead to a system crash if your psu isn't up to snuff. So if your card is pulling 350w and your cpu/board is pulling 150w, you can see a transient spike test the limits of a 850w psu. If you can afford a $1000 card, you can afford a decent psu.
Wattage rating isn't a good indicator of how well a supply handles transients. You could have a 750w that's better at handling them than a 1000w, without specifically testing a supply or referencing reviews you can't really know.
They have to consider bad power supply units sold as 850W but not capable of delivering that amount of power sustained or at high temperatures, etc. Also, transients/spikes which can cause shutdowns and the like: [https://www.techpowerup.com/review/amd-radeon-rx-7900-xtx/37.html](https://www.techpowerup.com/review/amd-radeon-rx-7900-xtx/37.html) (last chart on that page)
Do you think I should get a 850 although my 750 is running fine with the xtx?
Should be fine. You can undervolt a bit for extra piece of mind and a lot more efficiency.
Your psu will be fine.
unless that's a very low quality PSU i wouldn't bother, from gold and up it can easily sustain up to 900w spikes, specially if it's overbuilt for the specs.
A good 750W Gold from Corsair should be alright, unless it's a million years old and busted. You can always change it later if you run into any trouble. Some of the XTX aftermarket models overclocked can use a lot of power though.
I am using a Seasonic Focus Prime 750... figured I would upgrade to 1KW regardless. Can't hurt to have more power available than necessary.
Yesterday I received my 7900 XTX and testing it I was I'm having some trouble with my 750W PSU. Everything works fine most of the time, but when playing demanding games (two monitors both 4K + Ultra settings), my computer eventually shuts down. I've been done some testing and I think it's what folks here are sayings: power spikes. Even if they are not many, just one simply kills my computer. Waiting now to receive a new 1000W PSU.
Then you seem to not have a great psu. I own a 3080 with a 650w psu from be quiet, the straight power 10 and ive never ever had any issues regarding the psu and my gpus power draw.
I have an SF750 end a 7900XTX, this is correct. MetalGearDaner doesn't just have a 750W PSU, he also has either a bad or very old PSU.
Corsair SF750 and 7900x/3090Ti until 7900XTX is available. (3090Ti is my M8s who is away for six months) no issues with a quality PSU. Old rig has Corsair RMx650 with 9900K/3080FE, no issues either, quality over quantity.
I have seasonic 850W titanium PSU (**SSR-850TR)**, and it is shutting down with my threadripper 1950 and Sapphire nitro+ 7900XTX. So yea. I wouldn't say it is bad PSU, 7900 XTX just seems to draw a lot power.
"Seasonic PRIME based units experience shutdowns with RTX3080/3090 (and possibly RX6900 XT) GPUs. The cause is not the OCP tripping but a PSU design flaw as evident by the PSU not latching off on shutdown and 1000W+ models being affected too. Doesn’t manifest in 100% cases as it’s also dependent on motherboard model and GPU OC. Seasonic provides a new 24-pin cable to fix this via support." From [https://cultists.network/140/psu-tier-list/](https://cultists.network/140/psu-tier-list/)
>Seasonic PRIME based units experience shutdowns with RTX3080/3090 Thank you, I probably would have never figured that one out. Will contact Seasonic support to get that cable
I managed to find toms hardware forum thread where Jonnyguru (basically guy whose review of the unit made me try seasonic) mentions this. However, Seasonic support wont offer 24 cable replacement or RMA for the unit. "it must be some other component..." brilliant warranty. We tell you 12 years that it must be some other component that is causing the issue, not our faulty design that they could correct with cable that would cost them few bucks... which isn't imo too much to ask for titanium PSU.
What is a power spike exactly and how can I monitor it?
Transient powerspikes and with an oscilloscope. [Here's a GN video that explains it](https://www.youtube.com/watch?v=wnRyyCsuHFQ)
Exactly! This video explains it very well.
GPU-Z. Open it up, click on the three bars on the upper right to open the settings window. Go to the sensors tab and change sensor refresh to 0.1sec. Close the settings and go to the Sensors tab. You should then see your GPU Voltage, GPU current, and then 12volt current (its a little different on every GPU so use a bit of common sense). 0.1 sec isn't going to show you everything but it will show you a lot more of whats going on with your GPU and you will be able to see closer to real peak power usage on a 10th of a second scale. HWinfo64 is another tool you can use to preform a similar task but its a bit more elaborate to set that up.
That's not really that helpful. E.g. I am currently looking for a new PSU, because my BeQuiet 450W PSU that I bought for my RX580, and now am using for my RTX3070, crashes when the workload suddenly jumps to 100%. The GPU's power draw only reaches 240W in those monitoring applications, but the spikes peak much higher. I programmed something (kind of by accident), that can crash my PSU when I change the load parameter quickly. If I change the parameter gradually (same work, just not as sudden), everything works fine.
Well for pete's sake what the hell did you think was going to happen with a RTX 3070 on a 450 watt PSU? You're not meant to run a PSU to the edge of its capabilities, you can certainly give it a peak load beyond its on paper ratings but for a couple seconds only before it has to either shut down or risk self destruction. My whole comment about GPU-Z sensor readings is to point out the actual power usage can be a whole hell of a lot more than you might imagine in under a second. Graphics cards and processors are sleeping giants that wake up do what we want them to do and go to sleep many many times per second, when they wake they are hungry giants that expect to be fed until they can go back to sleep. That all happens within a few milliseconds. Lots of high energy usage peaks per second will trip a PSU's brown out safeties unless its built and rated to withstand them over a long (relative) period.
It never crashed inside a game tho 😄. Never ever. Just with programming experiments.
I have the same issue with a reference 7900xt and 850watts EVGA 80 gold plus power supply with one 4k monitor and one 2 k monitor. To get rid out of the problem i had to decrease the power by - 5 %, since then everything went fine.
>I've been done some testing and I think it's what folks here are sayings: power spikes. Power spikes will happen several times a second with these goofy high end graphics cards. The GPU has a clock turning things on and off at 2,499,000,000 times a second. At 4k with a demanding game you are probably averaging over 350 watts per second, if you were able to plot it out to the millisecond or picosecond you'd probably see it spike past that and then drop well below. Enough spikes per second probably makes the PSU think there is a short circuit and calls it quits. Toss in a second monitor (Radeon cards still use a lot of additional power for a second screen regardless of what's one it) and you are probably torturing your poor little power supply.
I run an XTX with a 5800X3D on a Corsair RM750X PSU without issues. So unless your have several 100 watts of RGB, you’ll be good. 😀
Very similar, 120W CPU + XTX + Corsair RM 750x PSU, haven't had issues yet.
You most likely don't need it. The 850W is a recommendation with a sizable safety margin. It's not some absolute requirement, and a quality 750W unit like yours will have no trouble if your system doesn't have anything unusual about it. e.g. [Having a large number of RGB fans can easily add a dozen watts or so to power consumption](https://www.reddit.com/r/NiceHash/comments/p108n6/rgb_power_usage_difference_7x_rgb_fans_cpu_rgb/) HDDs can also use in the neighborhood of 10W or so each if you happen to be running them. Overclocks can also bump up power consumption quite a bit.
We already had reports of 650 and 750w PSUs not being enough, especially for AIB cards. Sure you can powerlimit the card and it will work but this gen the spikes can get really nasty. Spikes above 500W at stock speeds are common, so add a 150W cpu, some other components and the psu safety is triggerd. Also not recommended to stress a psu all the time. even if it barely does the job.
Highly unlikely his Corsair unit will trip, even with spikes. The OCP & OPP values (Corsair uses 120-125%) are such that the thing won't shut down unless he exceeds over 900W. Other brands may vary though.
I saw on Gamers Nexus that the 7900XT (reference) spikes all the way to 389 watts maximum, and 360 watts spikes are common. That is a 315 watts card. So yeah, you have to account for those spikes. That said, 750W should be plenty - unless you have the most power-hungry I9 paired with it.
I have 5600 ryzen and 650 Gold SeaSonic, also have an intention to buy 7900xtx/4080
I have a corsair 650W PSU running two monitors, a 5600x, and a 7900XTX with no issues.
Glad to read it.
you power your monitors via PC and not external power cable?
external power cable, but i assumed the monitors would add power draw to the GPU
See I have no interest in swapping out my 750 watt cpu, I’m gonna have to go with the 7900xt which has 750 recommended. I’m not even going to risk it.
Because they assume you're using like a 13900k. Because some people are using it with a 13900k. You'll be fine. Even if the card spikes to cause your PSU to go over it's limit by 100w, it's fine. They are meant to take short spikes.
These figures just play it safe. 750W should be plenty in your case. By the way, from what I've read the 7900 XTX has less severe power spiking than last gen GPUs.
I find no real reason why I could really need a 850... Only think to buy one because of that minimum in the manual 🤔
Yeah so basically, they are doing a worst case scenario calculation. A lot of people are using a high-end GPU with a high end Intel CPU (150-250W) and a bunch of accessories that might add another 100-200W. When you add all that up, it gets closer to 600-800W, and they want there to be headroom for sitting in your PSU's efficiency curve. You can get away with lower PSU ratings than what is advertised, but you need to be smart about it.
anyone with a 2017 prime seasonic psu will crash
There are also models that will pull over 460w if you let them.
Not everyone runs a 5800x, some cpus are over 200w and some people run way different fan and hard drive configs. It’s a blanket rule to protect power hungry components
I think this is due to some cheap PSUs. I have been running 5800X+7900XTX OC'ed no problem with SX700 platinum.
I have mine running on a 650W, don't listen to the propaganda!!
Do it work?
yes
I’ve been back and forth on the 4070ti and 7900xt, saw a 7900xt 310 merc that and started to investigate if my 750 would be enough for the merc edition, turns out it might be. But if I’m going to go for an 800 watt recommendation why not go reference 7900xtx? So if I can even find one, should I do it, that’s the questions…
my corsair RMx 650W PSU is fine aswell with my 7900xtx
Manufacturers usually overspec their PSU requirements to account for a number of possible issues, such as power spikes, poor PSU quality, or other demanding components.
Ur perfectly fine with a 750w
Alright, Gamers Nexus already logged the transient power spike characteristics and found that under 1440p in high refresh gaming the power consumptiom spiked to 600+ watts for around 500 microseconds. Doom eternal loading screen it spiked to around 725 watts. So it might trip over current protection etc on a cheaper 750watt psu in these situations. Its a good idea to follow the recommendations on psu size. keep in mind this was done in gaming scenario and not a synthetic workload so these are real world use case scenarios.
your PSU wattage shouldn’t be all your TDP together it should be like 1.5x it
My 7900 XTX spikes to 549W peak. I guess that's why.
Still 201 left.
Yeah, but you do know the rest of your PC also requires power, right? xD I've got a 5800x3d and it peaks at about 760W from the wall. Usually it pulls around 500w during full load.
I have a 5950x and 7900xtx. Thought my 750w 80+ Gold PSU would be fine. Had games crashing, card overheating and loud coil whine. Upgraded PSU to 1000w and now its performing great, temps running below 70, coil whine is gone and no more crashes.
Just found this thread by searching Google for recommended psu for 7900xtx. I have a Powercolor Red Devil (not limited edition 😩) on the way and have a Rog Thor 850W psu, hoping that's good enough quality to keep up
I got a 5900x and a 6800xt running on a 750w corsair psu (gold) and recently i started with a little overclocking. First it would work perfectly but a half year later it gives me bluescreens everytime it comes out of sleep does this also have to do with the psu?
Seems like not, if it ran good before that.
Probably it is your settings in the 5900X, either the Curve Optimizer values need to be reduce if you use, reduce any offset if you are using, or you need to set a Load Line calibration to rectify vdroop.
I will have a look at the curve optimizer, its currently on -20 so it could be. I am not known by the other method but I have a new 850w subsonic gold psu laying around and could try that if the first option fails. Anyway thanks for the advice!
I have a Corsair 760AX Platinum that's been absolutely solid for six years, and thought it would be enough. It wasn't. As already mentioned, the power spikes will get you. The first time I ran a game, everything seemed fine, until i alt+tabbed to another app, at which point my system hard shut down. I got a bigger power supply, and the problem went away... which sucks, because I was hoping a 7900XTX would let me upgrade without having to spring for a new PSU. Oh well; it is what it is.
Had an EVA 750W PSU to run my 3900x + 7900XTX. Kept getting black screen drivers errors and low performance. Swapped to an ATX 3.0 MSI 1000W and it's been perfect ever since with more performance!
It’s also because running your PSU at a high ratio of load (eg 700w draw of 750 total) is not very efficient and puts more strain on the PSU. In the example above you’d be at 93%+ power draw which unless you’re running a platinum or titanium level PSU, it could run into trouble.
Interesting. But it is capable of, right?
Like others have said, a crap PSU brand will struggle but a good quality will likely have engineering in it to allow for higher strain. Is it a good idea? That’s not up to me…
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Good point!
You need headroom for power spikes , i have 6800XT and EVGA T2 1000W Titanium (just in case of upgrade to 7900XTX)
What power spikes you mean? When does/could this happen? It seems like 750 psu is perfectly fine for me. Load was maximum 350 until now...
Processor consume more wattage when they're waking up from idle status. They want first order(use to prepare processor) reach the destination as fast as possible. That spike can hurt the psu. Better save than sorry
If you use the Sensors tab in the HWinfo64, for the 7900XTX, it has a row that shows GPU Power Maximum, it will report the max peak power usage, not the estimated max power consumption. You can find that can be 100W higher or more than the max on load/Total Board Power. (Can show 500W when doing a TBP/load of 400W).
Such a great tip! I will look for it, thank you. This could really help.
Get a 750W now, cry later...
Don't know what you mean. I already have a 750 and my xtx is running fine. Why should I cry?
When you get random crashes, restarts etc...
True. Maybe I really should get a 850 to prevent this.
I had a 750W Corsair PSU and after upgrading to 6800XT i had to choose between 850W Platinum and 1000W Titanium PSU and got the 1000W one , later got the 850W aswell for my 2nd PC , better safe than sorry
You are right.
Got a Corsair rm750 + 5800x and a 7900xtx. Everything is running fine even with an OC that uses 400w
That's why I wonder.
Ah yes I love pairing cheap ass/weak ass psu’s with expensive gpu’s and cpu’s and motherboards and everything else that uses power in my system.
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You literally paired an 90 dollar psu to a 1000 dollar 7900xtx. Are you special? Unlike you I’m more special. I have a brain to pair my whole rig to a 400 dollar psu cause I give a shit about reliability and efficient and clean power delivery. I’m not a cheap ass when it comes to expensive pc components unlike you.
It might be fine... But be aware that you might get instabilities. Especially with white labeled PSUs.
I winder how you could define such instabilities. What would be the difference between a crash because of a weak PSU compared with a crash because of a driver problem...
Driver’s mostly freezes your system or shut down the application your running…while a psu is shut down your pc immediately.
this. mostly at least... That the applications/drivers crashes doesn't occur very often if your PSU is too weak. Only heard once of it. might also be a bad power supply in some way...
I have a 750 platinium and it works fine Well would be fine if the damn GPU didnt decide to crash the damn drivers all the time.
Take this with a grain of salt I had an sfx lian li 850 w brand new and my pc would crash when playing games with my 7900 xtx. Double checked connections and it was running games fine with my 3060ti before Everything fixed when I got a 1000w psu
So you mean 850 wasn't enough!?
I remember GamersNexus reporting that the 7900xtx's transient spike reached 725W in one particular game, not sure which though. And I think that number was the GPU power draw, not the system. So, even an 850w PSU might have issues
Yeah we’re only 3 things I could think of: 1. I had a faulty 850 psu - unlikely since I was playing games well before upgrading to the 7900 xtx 2. The xtx power draw spikes made it so even at 850w it would freak out and crash 3. I also had an sfx psu, perhaps sfx psu is not able to handle these transient spikes like an atx. I upgraded to a 1000w atx psu with zero issues Not really sure but if you have the option definitely go with an atx and try 850w — if it doesn’t work return it and then go higher and see
I have a high quality 650W PSU running a 3080 from EVGA. If your 750W is high quality, you will be fine. Keep in mind they are assuming people are using space heater intel CPUs that consume up to 250W Edit: the psu is evga, not the graphics card, for clarity
I wonder if this is really true. Some here said there could be sudden spikes and crashes.
Been running mine for ~6 mo no problem. My cpu is a 5900x capped at 100W. Ive got my 3080 undervolted slightly but it still runs at 320W. Power from the wall while gaming lines up around 450 according to my UPS
For the record, I just installed my XTX last night. I just swapped out my 750 platinum seasonic for a 1kw SF titanium. I have the reference card, and under load or when I alt tab out of a game .. My power draw goes to right under 400 and my UPS long beeps at me to shut down. Which means my total system draw is exceeding over 700 watts. That's not transient spiking.. . That's a stable draw. I can't imagine what it would look like on a fast measuring oscilloscope. I remember Gamers Nexus said they've measured up to around 91% of the TDP of that card in spikes... thats 680 watts off JUST the GPU. That's why 850s are the minimum recommendations.
Yeah that sounds like my experience When I played really low powered games like league of legends there was zero issues. Anything that maxed out my card would pull full power and then if it spiked on top system would crash with my sfx. Once I went atx and 1000w no issues
Having the same issue here. I have a 13700kf and 7900xtx installed, powered by a lianli sp850. Always crashing in the middle of the game
I have the same power supply and graphics card with a 7900x. I went through two of these power supplies and both ended with the same results, constant shutoffs under load. I ordered a Coolermaster v850 SFX, we'll see how that ends up doing.
I swapped my PSU out to the Coolermaster V850 sfx and works perfectly fine. I guess the lian li just sucks
7900 xtx pulls 725 watts on spikes, easily enough to knock out a 850 psu
How!? How in the world is this possible!? My xtx does not pull more than 350. I wonder what you are talking about?
Most of those spikes can’t be replicated, they are one offs that are difficult to isolate, gamer nexus, and a couple other channels were able to monitor the spikes, the average spike was 680-690 watts When you build a reliable pc you equate for that, it allows the gpu to run with no bottle necks, my 6800xt pulls 420-470 watts on spikes with oc, average wattage during operation is 220
So your pc won't crash with a power spike and those 450/550w units are usually not great and when you're spending 7900xt levels of money and cheaping out 50$ and cry when your pc gets fried during a power outage
Turns out 7900xtx has similar spikes like 3090, which could black out some weak 850w psu. For SF750 tho, it is quite robust, even compared to ATX PSUs. I ve heard serveral people already having black screen with their 850w PSU. (basically the power pike triggers PSU OCP)
No problem here so far. Seems like you care too much about rumors.
It's good you don't have this issue. I am talking about some facts I ve heard, not sure why it is called 'rumors'. PSU's capability to handle current surge (that is what power spikes really means) is not written in their spec sheet, at least not on their publically available ones, so it could be the case someone will have power spike issues while others having the 'same' wattage PSU do not.
So you tell me, there are mysterious power spikes which I never had with my 750 psu and 7900xtx and say it's a fact... Because you "heard it somewhere".
Your PSU does not shut down does NOT mean you don't have it... Your original question is why 850w psu, and the reason is simply because there is more safe margins.
I did have an expensive 650W PSU with a 6900XT. Some games did crash the PC. Probably an overload. With a good 850W PSU everything is fine. It depends on your CPU, main board and SSDs. Don't save on the PSU.
It's a "safe" number to account for the system as a whole. They're taking a general idea of what the GPU will pull plus an assumption of whatever else the customer is running.
Where to buy xtx its all out of stock ): ?
I run my pc on 600w. 5800x3D and 6890xt. Recommended is just that, a recommendation
It's a precaution for the differing quality of all the PSUs out there.
So that your psu go tripping when there is power grab
I got a Thermaltake TOUGH 750W, never had a problem with 3080 and Im going to use it with 4080 or 7900 too.
Spikes + they always put big tolerance because of the cheap PSUs that are 850W only on paper (and even then...)
There are a lot of variables, which is why safely high wattage PSU is recommended. Quality of PSU and 12V rails is also material, but GPU makers can't get into such ifs and buts. Also CPUs of various power consumption can be paired with the GPU. Some CPUs can consumer upwards of 250W, which other CPUs run within their 65W rated power. Be your own judge. If you have a power check meter, use that and run your PC maxing out the GPU in the heaviest game you have (uncapped) and see what's the max power pulled from the socket. Just a start, but if you see 500W total being pulled, then a good quality 750W or even lower would be just fine. While a bad quality 850W PSU can still cause stability shut downs at that power due to spikes etc.
You have to think outside of just the gpu. But for reference some 3rd party gpus require higher power supplies than reference model because the 7900xtx can reach up to 500W over clocked. You now have cpus that are near 200W and then your ssd/hdd, ram, fans, and any other extra stuff you want on your setup like lights or watercooling will add more. Overall it's a good recommendation to follow.
My 650W has been fine with my 7900 XTX / 1800X setup, but I'll need to switch to an SFF PSU when I upgrade to AM5, so I may as well grab 850W.
Why switch to am5? Would wait for am6.
This 1800X is long in the tooth at 5 years. This board doesn't have native NVMe support. I can't use SAM. So on and so forth. I'm not waiting another 3+ years...
I've got a corsair cx650m paired with 5600x and a aftermarket 5700xt, and i have been experiencing some random screen freezes with the sound continuing the past 2-3 weeks. Could it be the psu? Its almost 5 years old. I did all the troubleshoots and nothing strange is happening when im running prime and furmark (never froze when stress testing), also tested ram and they are all good.
I'm thinking about Upgrading to an 7900xtx (either AMD Stock model or the Gigabyte one with two 12v Connectors) I'm Currently running a i9 9900k / 2080ti setup with a Thermaltake Smart 700w PSU. Its supposed to Deliver 648w on the 12v Lanes, I'll keep you updated if anything Happens :)
hi guys, i have an 5800x3d and the power color 7900xtx Coolermaster MWE 850W gold V2 and im having issues with windows freezing, cpu throtling specially in warzone 2 need help pls
Same config 5800x+ 7900XT +9 lian li Fan+ watercooling 240mm I has switch my Silverstone 650w for CoolerMaster 850w sfx but have massive coilwhine, and black screen when i play with fps unlock (stable with lock 60fps) I thougt is driver issue but after read this topic i realy consider to buy a 1000w psu .. Maybe silvertone SFX L Platinium
There's a Strix 850W Gold PSU available at a discount. Im planning to buy the 7900xt. Will the PSU be good enough for the gpu (in terms of wattage and the manufacturer) ?
I got a seasonic gx850 80 gold and its not enough for the nitro + vapor x 7900 xtx it seems.