Want to future proof a bit...

Tykey

Tykey

Tykey

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I'm looking to buy a pc from overclockers, i'm using the configurator but when it gets to psu i'm unsure. the cpu will be a 11900k or 5900x, the gpu rtx 3090. i know 750/850w will be enough, but i'm thinking what happens down the line when nvidia release 40xx gpus, what psu will they require? as i will probably upgrade then.

so get your crystal balls out, what psu for 40xx series cards?
 
If the next generation gpus use even more power something is wrong, they're already over the top. Next generation ought to see some efficiency improvements.
 
tyke_ said:
I'm looking to buy a pc from overclockers, i'm using the configurator but when it gets to psu i'm unsure. the cpu will be a 11900k or 5900x, the gpu rtx 3090. i know 750/850w will be enough, but i'm thinking what happens down the line when nvidia release 40xx gpus, what psu will they require? as i will probably upgrade then.

so get your crystal balls out, what psu for 40xx series cards?
Click to expand...
Is it even worth buying a 3090 if you plan to upgrade in a years time to RTX4000? Sure if you buy a 850w psu and it turns out you need a 1kw then it will cost you an extra £100 or so after selling the 850w yet the 3090 you will lose like £1000 on as soon as next gen releases.
 
You also need to factor in that Intel is trying to push that new 12v atx thing. Now whilst Intel has tried pushing changes before and failed, stranger things have happened, and it may end up being the new standard, meaning your new PSU investment may not be so future proof if that were to come to pass. So it might be better to hold off a tiny bit unless you REALLY need to change and update your PSU right now.
 
nlel1975 said:
Well a 1200W will run two 3090s an overclocked i9-11900KF, two SSDs and two mechanical hard drives. This according to the EVGA power meter.

https://www.evga.com/power-meter/
Click to expand...


1200w will not run dual 3090s in a stable manner especially oc 3090 models (even setting the oc models to none oc via the bios switch and same result OCP kicks in), been there done that with a few brands of the top 1200w psus. I ended up with a BeQuiet dark power pro 12 1500w that worked great (in multi rail setup and of course in single rail setup, but Multi rail is the safer setup due to each rail having its own protection working). The spikes cause random OCP to kick in and the whole pc goes off even when the 1200w psus were stuck on single rail from their default multi rail setup.

My system here :- https://forums.overclockers.co.uk/posts/34846430/

Linus did a video too showing sli/nvlink 3090s and his psu failed too and had to use a 1600w psu to make the system stable.

As you will see here too when testing 3090 fe models in sli/nvlink they had issues with a 1200w psu too.

https://www.techwarrant.com/nvidia-geforce-rtx-3090-sli-it-could-have-been-this-beautiful/


Power consumption
Given the limited time in which we had two RTX 3090 FEs, we did not perform extensive current measurements. Total system consumption during the heaviest workloads was 880 watts, but the peaks were probably much higher. Initially we had set up a system with a 1200W power supply, but it failed during the benchmarking of Shadow of the Tomb Raider.
 
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For the new high end cards, 850W is supposed to be enough and some are running fine on good 650/750W. I went for a RMx 1000W as the last time I got a 650W when people where recommending 500W as been enough for any single card and I still had to get a new PSU as I did not want to risk issues. If a 1KW is not enough for the next card's, something is very wrong with them!
 
Was using an EVGA 750W Gold with mine 3090 + 3900X, no overclock, fine. Just the PSU fan was noisy. Replaced with the Corsair RM1000, coil whine, now Seasonic Prime 1000 Gold.
It's not all about power, but also efficiency curve.
My whole system, when I last tested from the socket, was using about 500W. The 3000 series does have it's peaks, which a solid 750W PSU should do.
A solid 850W PSU should be fine.
A 1000W PSU should operate at a better efficiency.

About actual GPU power consumption, is quite interesting, as there's so much pressure to adopt electric cars, more efficient house appliances, house heating, etc, but GPUs pulling 350W-500W, and the government haven't looked into it yet to try and cash some extra tax :D
Anyone playing for a while can notice how efficient those GPUs are heating the room. Can't wait for winter.
 
EVGA power calculator say's I would use 529W and be OK with a 600W PSU:eek:. I have a EVGA 650 G2 but did not want to risk it. I Also have a EVGA 850 G2 in my other pc but its ~7 years old so decided to just get a new one.
 
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