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[Need Help] with PSU for 1080ti + 3080

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Posted · Original PosterOP

Hi people,


Here is my a bit "interesting situation".

My current Setup:

CPU: AMD Ryzen 7 2700X
PSU Dark Power Pro P11 750W (BN252)
RAM: G.Skill DDR416 GB, 3200MHz
Board: Asus PRIME X470-PRO

And here is a thing, I want to put inside 
GPU: MSI GeForce RTX 3080 Ventus OC 3X

I understand my current PSU should work fine,
BUT! I want to keep inside also my 1080ti. Im using software called Aster, so 2 people can use 1 PC at once. I can assign 1GPU to one workstation and another to second. 


1)  In this case I don't know if that PSU is enough, and how much more will be needed?
"Bigger" PSU are much more expensive.

2) So maybe I can just use another "smaller" PSU and attach it to the 1080, since like good 450 psu is about 1/4 price of good 1000 psu?
I did it in 2011+- (see attachment) and worked well for couple of days, when I was waiting for next PSU, I was young and i ran out of power cables :P
Also this second I can turn on only when needed, don't have to run all the time.

But should I do it?

(02.2011 :D)


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You can use dual PSU, take a look at the video.

No need to run it from the other pc, might be dangerous to the gpu.

Ryzen 2600 @ 4ghz | Radeon RX580 | 32gb HyperX 3200mhz | 500gb Samsung PM981a | 5 TB HDD | Corsair CX450

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You will have about 600 watts of GPU. If you don't put load on them at the same time you will be fine.


What I would do is see what power your GPU is using on your workload.  

You can do this with GPUZ sensors. Then add the 320 watt TDP of the 3080. Then use HWinFO64 to get your CPU power usage under load. Add about 50 watt for the rest of your system and you will have a good idea if you are ok or what you need.  


If you go with 2 PSUs you have to run them all the time. Nvidia cards have a low power sensor that may stop your displays from working. 


RIG#1 CPU: Intel i9 10900k | Motherboard: ASUS ROG Maximus XII Hero | RAM: Corsair Vengeance RGB Pro 16GB DDR4 4000 | GPU: EVGA  RTX 2080 ti FTW3 ULTRA | PSU: EVGA 1300 G2 | Case: Cooler Master H500M | Cooler: SilverStone PF360 | SSD#1: Crucial P1 1TB | SSD#2: Crucial MX500 2.5" 2TB | Monitor: LG 55" 4k B9 OLED TV

RIG#2 CPU: Intel i7 8086k, 5ghz all cores| Motherboard: ASUS ROG Maximus X Hero | RAM: G.SKILL Ripjaws V Series 16GB DDR4 3200 | GPU: EVGA RTX 2080 ti FTW3 ULTRA | PSU: Corsair RMx1000W | Case: Cooler Master HAF X | Cooler: Noctua NH-D15 | SSD#1: Crucial MX300 2.5" 1TB | SSD#2: Crucial MX500 2.5" 1TB | Monitor: LG 55" 4k B9 OLED TV


RIG#3 CPU: Intel i9 9900k, 5ghz al cores| Motherboard: AORUS Z390 Ultra | RAM: Corsair Vengeance RGB Pro 32GB DDR4 3200 | GPU: EVGA GTX 1080 ti SC | PSU: EVGA 1000 GQ | Case: Streacom BC1.1S | Cooler: Noctua NH-D15 | SSD: Samsung 870 EVO 2TB | Monitor:Samsung 28" 4k 60hz  

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Posted · Original PosterOP

Thanks for replays, I'll test it soon,
I don't think I'll push everything to max at the same time :)

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