4x What GPU for 1250W Power Supply

[phdstudent]

I am planning to get a i7-4820K and OCZ 1250W PSU (http://www.newegg.com/Product/Produc...82E16817341046). What are the 4 fastest NVIDIA GPUs I can fit for this system? I posted earlier, and I think the 4x GTX780 is too power hungry, would 4x GTX770 work? Or would I need to go even slower?

Thanks.

 

[Shmee]

Hey, not positive about power requirements for 4 cards, but what is the need to have 4? If for gaming, 2 or 3 780s would be preferable. 4x 770 might work, but seems to either not have enough memory for resolutions/games where 4 cards would be useful, or just wouldn't scale as well.

It is usually best to get fewer (or one) higher end card(s). Also, 780ti is around the corner, could pick up 2 of those and be good.

Also, would you be OCing, and at what resolution do you play games, if that is your purpose?

 

[OVerLoRDI]

What resolution are you planning to game at? 4x GPUs might be completely unnecessary and cause you way more trouble than it is worth.

 

[Erenhardt]

You are looking for cards for CUDA research? I would go for GTX Titan then, those are known for their not limited compute performance. 1250W is good for 3 of those and there should still be a lot for the CPU and rest of the system.

 

[phdstudent]

Hey, not positive about power requirements for 4 cards, but what is the need to have 4? If for gaming, 2 or 3 780s would be preferable. 4x 770 might work, but seems to either not have enough memory for resolutions/games where 4 cards would be useful, or just wouldn't scale as well.

It is usually best to get fewer (or one) higher end card(s). Also, 780ti is around the corner, could pick up 2 of those and be good.

Also, would you be OCing, and at what resolution do you play games, if that is your purpose?

This is for zero gaming. This is for CUDA research. I need 4x cards because the research is about scaling an algorithm across 4x GPUs. 4x GPUs is a must (non-negotiable), just want the fastest 4x cards possible with this power supply. I don't want to goto a 1600W PSU since I am not sure about electrical wiring needed...

 

[3DVagabond]

You are doing it backwards if you are picking the PSU before you've decided what hardware it needs to power.

 

[TreVader]

weirdest post i've ever seen.

It's like asking "what kind of BMW should I get for this size air freshener?"

 

[horza]

..

 

[3DVagabond]

Just looking, you should be able to run 4xTitan with the card set to DP mode. You'll really be pushing that PSU, but it should be fine. 4x770 would be a piece of cake.

If you want to you could check at JonnyGuru. PSU's are their specialty and even many of the PSU hardware testers post on the forums there.

 

[phdstudent]

Just looking, you should be able to run 4xTitan with the card set to DP mode. You'll really be pushing that PSU, but it should be fine. 4x770 would be a piece of cake.

If you want to you could check at JonnyGuru. PSU's are their specialty and even many of the PSU hardware testers post on the forums there.

My research does not require DP, I am SP -- do you think that would still work? My math is

250W * 4 GPU + 130W CPU + ?? Motherboard + ?? 2x SSD + ?? Misc >= 1130 W

and the PSU is 1250W... cutting too close?

 

[Ajay]

My research does not require DP, I am SP -- do you think that would still work? My math is

250W * 4 GPU + 130W CPU + ?? Motherboard + ?? 2x SSD + ?? Misc >= 1130 W

and the PSU is 1250W... cutting too close?

Yeah, I think so.

TDPs on the GTX 760s are typically under 175W (700W total). Seems pretty safe and you get 4600 CUDA cores to play with for around $1K. Seems like a sane choice to me (for multi-GPU SP work). No need to push it the limit. You can determine how much you are saturating the PCIe lanes if necessary and extrapolate (by testing using different multiples of active SMX clusters) if need be.

 

[3DVagabond]

My research does not require DP, I am SP -- do you think that would still work? My math is

250W * 4 GPU + 130W CPU + ?? Motherboard + ?? 2x SSD + ?? Misc >= 1130 W

and the PSU is 1250W... cutting too close?

I'm not saying set it to DP because you need DP. It runs at lower clocks. That will give you increased stability and lower TDP.

That 1250w is continuous. The odds of running all 4 GPU's and the CPU @ 100% load continuous is pretty slim.

The mobo probably maxes out at 60w, RAM is ~1w/gig, SSD peaks @ ~5w, 225w per card in DP mode (IIRC), fans ~2w ea.

 

[janii]

I am planning to get a i7-4820K and OCZ 1250W PSU (http://www.newegg.com/Product/Produc...82E16817341046). What are the 4 fastest NVIDIA GPUs I can fit for this system? I posted earlier, and I think the 4x GTX780 is too power hungry, would 4x GTX770 work? Or would I need to go even slower?

Thanks.

You will be able to run pretty much every card x4

 

[NTMBK]

How about a pair of GTX 690s? It's actually 2 GPUs on each card (and recognised as such by CUDA), so you get 4 CUDA GPUs in the space of 2. This gives you more options for case and motherboard.

 

[dave_the_nerd]

weirdest post i've ever seen.

It's like asking "what kind of BMW should I get for this size air freshener?"

Yeah. Decide what GPU(s) you want, and get a PSU (or two) to match it/them.

 

[Ajay]

How about a pair of GTX 690s? It's actually 2 GPUs on each card (and recognised as such by CUDA), so you get 4 CUDA GPUs in the space of 2. This gives you more options for case and motherboard.

That's actually a pretty good idea :thumbsup: