transient power consumption spikes

serpretetsky

[H]ard|Gawd
Joined
Dec 24, 2008
Messages
2,016
You let other people be guinea pigs and buy hardware combinations confirmed to be working by other people on the internet. It's not hard. That's some of the best advice anyone would ever get with building pcs on the internet, yet none of these streamer/vod scumbags will ever just say it.
This would be good advice for people getting ready to build a new a new system. But I would want to hold manufacturers (PSU / GPU / CPU / whatever) to a higher standard. Ideally if the GPU says you need 500W ATX PSU, you should be able to just get any 500W ATX PSU and it should work reliably. This is not how it is, and it may never be like that, but I think we should always aim for standards and interface specifications that can be depended on.

Apprently ATX 3.0 allows spikes of 3x power for 100 us.
https://www.pcworld.com/article/631...upplies-their-first-overhaul-in-20-years.html

Despite this, I feel like this is better fixed on the GPU. If the GPU needs 3x power draw for 100us it should be up to the GPU to put more capacitors on their board. Small high power transient spikes are usually better served by bringing capacitors as close to the destination of the power as possible.
 

bluestang

Gawd
Joined
Dec 14, 2018
Messages
603
I always buy a PSU equal to 2x what my systems would draw at full load (both CPU & GPU combined). As most PSUs rated efficiency are in that 50-60% range anyways right?

My 3080ti + 3900X system is drawing 583W according to my UPS so having a 1200W Platinum PSU makes sense to me :)
 

WilyKit

Limp Gawd
Joined
Dec 18, 2020
Messages
448
As most PSUs rated efficiency are in that 50-60% range anyways right?
I mean... yes, but not in a meaningful way 80+ Gold for example is rated for 90% efficiency at 50% but you still get at least 87% efficiency at 100% load. The efficiency difference between 50 and say 70-80% load which still gives you plenty of headroom is probably closer to 1%
 

MrCaffeineX

[H]ard|Gawd
Joined
Aug 22, 2011
Messages
1,581
This would be good advice for people getting ready to build a new a new system. But I would want to hold manufacturers (PSU / GPU / CPU / whatever) to a higher standard. Ideally if the GPU says you need 500W ATX PSU, you should be able to just get any 500W ATX PSU and it should work reliably. This is not how it is, and it may never be like that, but I think we should always aim for standards and interface specifications that can be depended on.

Apprently ATX 3.0 allows spikes of 3x power for 100 us.
https://www.pcworld.com/article/631...upplies-their-first-overhaul-in-20-years.html

Despite this, I feel like this is better fixed on the GPU. If the GPU needs 3x power draw for 100us it should be up to the GPU to put more capacitors on their board. Small high power transient spikes are usually better served by bringing capacitors as close to the destination of the power as possible.
Something tells me that GPU manufacturers that already skimp on the components will be less than enthusiastic about increasing the bill of materials even a few cents to compensate for this when they can deflect blame to the PSU.
 
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