Sub-500w high end gaming setup, 5800X3D + RTX 4090

[Golgatha]

I will preface that the RTX 4090 is huge, like I had to move my front case fan even though I thought I had more than enough room in my case huge. My design goal was to get the highest FPS possible within a 600w limit. After doing some reading, I found Cyberpunk 2077 with all the bells and whistles turned on would give me the highest electrical load my system is likely to see.

Settings for the main power chugging components:

Ryzen 7 5800X3D - Power limits set to 110, 75, 90
(about a 10% performance penalty in all-core engaging things, but no gaming penalties)

Zotac 4090 - Power limited to 85%
(no degradation at all in performance)

Random thing - I have an about 8 year old Corsair 850w power supply. I used this adapter cable from a seller on Amazon. I'm pretty certain I wouldn't like the cable management at all if I didn't have this adapter cable.

https://www.amazon.com/gp/product/B0BN1G4M15

 

[CP5670]

The 4090 is quite efficient and uses under 350W in most games even on the default power limit. The idle power is a bit high though, like 35W.

 

[alcoholbob]

The 4090 actually has less power spikes than 3080/3090 so it should be generally easier for most power supplies to deal with. The problem with GA102 was the huge power spikes (often 1000W+) that came from transitioning from 2D to 3D clocks. Alt-tabbing from a game or going from loading screen to gaming world would often trip PSUs. Sustained power use like benchmarking and gaming itself was not typically a problem.

Even then, 850W was enough for GA102 cards except the aftermarket ones with high TDP BIOSs.

 

[Shmee]

You can also undervolt it a bit, and you should get around 99% performance at under 300W.

 

[Golgatha]

You can also undervolt it a bit, and you should get around 99% performance at under 300W.

I'm probably around 300w for the GPU anyway. The 488w figure in the picture is for the entire computer, and some pretty negligible power draw from networking equipment for what it's worth.

 

[Baha1973]

I have 3900X cpu with 4090 and the PS is the same Corsair RM850x.
I set power limit for 300w for GPU giving much than 90% of its performance and no problem gaming on 4k monitor for max. gaming setting.

 

[CP5670]

I find RT games use much more power than raster games, 100-150W more at 4K. I set the limit to 500W (the card's default is 480W and max is 600W) and the only time it hits that is RT at 4K. The higher idle power I get may also be specific to this model, which has an AIO pump. The fans turn off on idle but I can't tell if the pump does or not.