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RTX 5080 PSU Requrements (will a 750w cut it?)

basilthefox

basilthefox

basilthefox

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I'm about ready to upgradge my old GPU (RTX 2060S) to a fancy new 5x series - I'm looking at a 5070Ti, but financially I can push to a 5080, so I'd like to go as high as I can with it if possible.

I'm still on AMD4 and recently upgraded to a 5700X3D.

Here's the meat of my question - I have a 750W PSU.

Checking the power requirements on the RTX 5080 pages it seems to require an 850W GPU if both the CPU and GPU are overclocked, so since I'm coming up from a modest 2060 super, I'm really not going to be bothering overclocking at all.

www.overclockers.co.uk

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Looking up power draw for CPU & GPU shows

5700X3D - TDP = 105 W
RTX5800 - TDP = 275 W
Extra system resources - keyboard, mouse etc nothing special ????

375W in total so that leaves plenty of overhead.

Looking at the power draw a 750W should be able to handle it, and it looks like to me the manufacturers are being a little bit over cautious in power draw requirements.

In short, I'm wondering if any RTX 5080 users are running a similar set-up with a 750W PSU?

If not, I'll weigh-in for a 5070Ti as I don't feel like it's going to be worth the time, effort & money to upgrade the PSU on my current platform.
 
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I don't think you can calculate on averages as much as max amounts. 5080 can top out at 360w, not including transients. Which is incidentally is another question, is your psu atx 3 at least? If not then transient spikes might be a problem. I had a 850w reputable psu that eventually started having issues with transient spikes on my 3080, the 3080 having similar power draw to the 5080.

Hopefully some users will chime in with 5080 specific advice.
 
PSU is a now discontinued Corsair RM750x 80 PLUS Gold

Acording to the spec it's ATX V2.4

5080 plus new PSU would push me over budget, so right now it's looking like a 5070Ti unless any 5080 owners can chime in.
 
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I think that pretty much settles it then chaps, I'll most likely drop for a 5070Ti to be on the safe side - the RTX 5080 would be a little stretch, but adding a PSU would push me over what I can spend and like @Captain_Bosh said, it's probably not worth risking a +£1000 GPU for it.

I'll keep my eye on the thread just in case any 5080 owners chime in, but I'm going to err on the side of caution at this point.

I appreciate the replies chaps.
 
basilthefox said:
Looking up power draw for CPU & GPU shows

5700X3D - TDP = 105 W
RTX5800 - TDP = 275 W
Extra system resources - keyboard, mouse etc nothing special ????

375W in total so that leaves plenty of overhead.
Click to expand...
You're correct that 750 is not a problem in theory, but as already mentioned above, the actual power usage is not that important to knowing if your PSU can handle the card.

The main question is: how does your old PSU cope with the power spikes?

Many older PSUs can handle this fine, some appear to be fine but have excessive ripple, other PSUs will just trip/shut down. This has been an issue mainly since the 3000 series launched and ATX 3.x PSUs are supposed to address this by mandating that the PSU is designed to cope with it.

My own opinion would be that if your PSU can't cope with a 5080, it is pretty likely it will still trip with a 5070 Ti. There's also the simple question that does your PSU even have enough power connectors for the adapter?

If you were to buy a 5080 and had problems, you can always power limit/underclock the card which would reduce the overall power consumption and the power spikes. That would be my preferred option rather than buying a lesser card just because of the PSU. When you have the cash, you could then upgrade the PSU and have the faster card operate at max. If the 5080 is good value against a 5070 Ti or 9070 XT, that's another question.

bobert50 said:
oof. I genuinely didn’t know that the older Corsair’s might need replacing. I’ll read up some more now.
Click to expand...
You don't have to replace a pre ATX 3.x PSU, many of them are more than capable of handling a modern card.
 
My current PSU handles the 2060S and 5700X3D just fine. I have no problems at all with it all. I'm not doing any overclocking.

An option based on what you're saying @Tetras would be to upgrade my PSU to a fat 1000w in the meantime, then get the GPU once I'm set-up with that and be 100% comfortable with whatever I'm upgrading to.
 
Tetras said:
You're correct that 750 is not a problem in theory, but as already mentioned above, the actual power usage is not that important to knowing if your PSU can handle the card.

The main question is: how does your old PSU cope with the power spikes?

Many older PSUs can handle this fine, some appear to be fine but have excessive ripple, other PSUs will just trip/shut down. This has been an issue mainly since the 3000 series launched and ATX 3.x PSUs are supposed to address this by mandating that the PSU is designed to cope with it.

My own opinion would be that if your PSU can't cope with a 5080, it is pretty likely it will still trip with a 5070 Ti. There's also the simple question that does your PSU even have enough power connectors for the adapter?

If you were to buy a 5080 and had problems, you can always power limit/underclock the card which would reduce the overall power consumption and the power spikes. That would be my preferred option rather than buying a lesser card just because of the PSU. When you have the cash, you could then upgrade the PSU and have the faster card operate at max. If the 5080 is good value against a 5070 Ti or 9070 XT, that's another question.


You don't have to replace a pre ATX 3.x PSU, many of them are more than capable of handling a modern card.
Click to expand...

I should probably add my RM850X PSU didn't start having issues with the transient spikes from a 3080 until around 4 or so years into both the PSU/GPUs life(I got them both around the same time), and it was only one game that it'd just trip on. I knew I was going to be upgrading to a new GPU soon anyway, so that's why I ended up buying a new PSU more than anything. I think I probably could have also solved it by doing a power limit when I played that one game. I chalked it up to general wear.
 
I'm running a 5080 on a 10 year old PSU, but it's 1000W and a very good one (Superflower Platinum). You should be fine though I think, especially with that CPU, your PSU is decent and especially if you undervolt the 5080 which everyone should be doing anyway - less power draw, less heat, better performance.

If not, then worry about upgrading your PSU. Nvidia officially recommends 850w for the 5080 so take that how you want to.

The only potential problem is, at the moment the drivers are so thoroughly **** for the 50 series that you may get 'odd' behaviour (crashes, lockups, blackscreens, you name it!) you might think is PSU related, when it's more likely to be driver related.
 
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850w psu with a 5700x3d and 5080. Zero issues. However if I was buying new of course 1000+ for future upgrades.
 
Used a 750w with my 13900K and 4090 for approx a year with no problems at all.
Remember you'll probably under-volt your 5080 because it nets better performance with less power

The 5080 uses less juice than the 4090 (especially undervolted) and the 5700X3D uses a lot less juice than the 13900K so I think you'd be fine
My 750w was a SF750 which is known to be very strong, but yours should still be ok, just remember to order the proper cable from Corsair
 
Kirby Wurm said:
A mate's 650w EVGA PSU ran my 5080 fine alongside his 7800X3D while I was testing a potential issue using his system. It is a platinum rated model, but still around 5 years old. Make of that what you will.
Click to expand...

What was the exact model of the PSU and what games was he playing at what res?

Was he capping frames? I do this via RTSS and it can substantially reduce energy requirements.

"Platinum" means very little, it simply relates to how efficiently the supply uses energy. You could technically have a bronze unit that was of a higher overall quality than platinum, although admittedly that's highly unlikely.
 
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