[Need Help] with PSU for 1080ti + 3080

[Isu]

Hi people,

 

Here is my a bit "interesting situation".

My current Setup:

CPU: AMD Ryzen 7 2700X
PSU Dark Power Pro P11 750W (BN252)
GPU: ASUS GTX 1080TI FE
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
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 )

[SupaKomputa]

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.

[jones177]

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. 

 

[boggy77]

150W cpu

250W 1080ti

350W 3080

50W rest of system

800W total if you stress everything to the max at the same time.

you should be fine with your current psu.

[Isu]

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