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580 SLI on an 850W

B

bullbearish

Member
Any of you gentlemen (or ladies) running 2x SLI 580s on an 850W power supply without issues? I understand the 580s are power hogs and question if I need to go to 1000W to run BF3 full stop.
 
What kind of 850w?

A seasonic 850w? Then your answer would be yes.
 
I think you will even be fine as long as you are not overclocking an AMD FX CPU. I would invest in a $17 Killawatt just to make sure you are not exceeding the continuous power rating of that PSU.
 
Thanks for the links and feedback, folks. I do like to overclock my CPUs and GPUs. 850W seems marginal if BF3 runs at load similar to Crysis. I may just wait until the 7970s become more available and xfire 2 of those. They seem to require 100 to 200 less wattage. I can sell the 580 and squeeze a little more performance out of the system for not much more cash.
 
bullbearish said:
Thanks for the links and feedback, folks. I do like to overclock my CPUs and GPUs. 850W seems marginal if BF3 runs at load similar to Crysis. I may just wait until the 7970s become more available and xfire 2 of those. They seem to require 100 to 200 less wattage. I can sell the 580 and squeeze a little more performance out of the system for not much more cash.
Click to expand...


Or sell your 580s and pick up two 7950s. Sell them soon while they still bring decent $$. I have been seeing them dip in price below $400 now.
 
I am running 2 GTX 580 MSI Lightning Xtreme cards on an AX850 without any issues. I don't have them overclocked but my 2600k is overclocked to 4.2GHz at 1.28V.
 
bullbearish said:
What kind of framesrates are you getting?
Click to expand...

I think the last game I checked the frame rate on was SC2, which was running 128 fps on maxed settings (1900 X 1200).

I also play Dota 2 which doesnt really stress the GPU much, and SWTOR which I play with all settings maxed except bloom is turned off and it runs smooth.
 
SLK said:
I think you will even be fine as long as you are not overclocking an AMD FX CPU. I would invest in a $17 Killawatt just to make sure you are not exceeding the continuous power rating of that PSU.
Click to expand...

I've never seen such a thing. Looked it up on Amazon. Pretty cool. I've got a 2600k turned up to 4.7G and my 580 is overlclocked by about 20%. It will be interesting to see what kind of power I am drawing currently.
 
Guru3D which is a site that I trust completely for psu recommendations recommends at least a 900w if you do no overclocking.

I would say your 850w would be fine if you didn't overclock the GPUs and maybe had a very small overclock and overvolt on the CPU. More then that and 1kw is needed.

Your PSU is of a higher caliber then most PSUs which is why I think it would be fine.
 
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It will be mighty close. As long as you have a nice PSU I think it will work but you won't have much headroom for anything
 
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