Question PSU for two 1080 Ti's. used for GPU rendering, not gaming.

[timot.mo]

Hi, I never really trust PSU calculators so thought maybe you fine folks can help me narrow down a PSU.

My computer is built and working fine with these

Aorus Master z390
8700K OC to 5 GHz @ 1.32 v
1080 ti
750 Seasonic Titanium
64 gigs of RAM

I need to add one more 1080 ti and although I've built what appears to be a gaming PC, well I don't game.

This computer is used only for VFX work and primarily GPU rendering in Redshift. However I still pull out the CPU renderer engines sometimes too.

It doesn't seem like Redshift pulls from the CPU that much but if I add another 1080 Ti, would my 750 watt PSU be enough?

The PSU calculators say that this setup could pull over 850 and go on to recommend a 1000w PSU which seems excessive to me.

I Guess the 1080 ti's can draw 250W each? So that's 500.. but does the cpu, ram and HDs need another 500?

Thanks for any help on this.

 

[jankerson]

GTX 1080Ti's can pull well over 300W each.

No your 750W PSU isn't enough.

I would say at least an 850W PSU, a 1000W even better.

 

[timot.mo]

Hey, thanks for your reply. Good to know the PSU calculators have generally been right then. I read the the seasonic 850W PSU can actually pull as much as 1000w. But I suppose I should just go ahead and the 1000w anyway.

Thanks again.