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Can i SLI?

Last response: in Graphics & Displays
May 25, 2012 10:39:07 PM

Hello, i was wondering if it would be possible to run sli with a ASUS GTX 580 Direct CU II and a EVGA Geforce GTX 580 DS, running on a 750w Power Supply

Any help appreciated, Thanks in advance

More about : sli

a c 236 U Graphics card
May 26, 2012 12:09:51 AM

those cards can be SLI assuming your mobo supports SLI

as for power

Measured power consumption

System in IDLE = 237W
System Wattage with GPUs in FULL Stress = 719W
Difference (GPU load) = 482W
Add average IDLE wattage ~ 20W x2
Subjective obtained GPU power consumption = ~ 522 Watts

your power supply would be cutting it very close and that would be with a quality PSU. you don't post what PSU you have.
May 26, 2012 12:19:45 AM

Ah, my mobo supports sli and the power Supply is a Lepa B750 750w modular power supply
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May 26, 2012 12:21:47 AM

It does have all appropriate cables to run multiple graphics card's
May 26, 2012 12:30:04 AM

kmanderson62, you'll be right on the edge trying that. Even a quality PSU isn't intended for this. A GTX 580 requires 244 watts so, x2 will be ~ 500 watts.

If you have the $ for two GTX 580 then why not upgrade your PSU for peace of mind?
a b U Graphics card
May 26, 2012 12:31:33 AM

As ct1615 points out, 750w would really be pushing it. An upgrade to the PSU would be seriously recommended.
May 26, 2012 12:44:43 AM

Allright, i think it would be better to play it safe, think a 850 would cut it? Or best to go up to a 1000+?
May 26, 2012 12:46:07 AM

You'll be fine at 750W. A little maths might clear things up. So, lets say two GTX 580's @ 500W + CPU @ 130W (Exaggeration unless you have an 8000 series FX, Socket 1366 i7, or SBE) + All other components @ <120W = less than 750.

And this is an exaggeration. Lets be honest, when is a machine like that going to be under full load? VSync will rein the 580's in in all but the most brutal scenarios. You're not likely to be under full CPU load whilst gaming either.

TL,DR: You'll be fine.
May 26, 2012 12:49:58 AM

Not to sure with it cutting so closely, dont want to risk anything with components this pricey

May 26, 2012 12:54:24 AM

Well, Thanks for the help guy's ill upgrade to a 1200w Modular PSU while im getting the card's

Thanks again
a c 236 U Graphics card
May 26, 2012 1:19:52 AM

kmanderson62 said:
Well, Thanks for the help guy's ill upgrade to a 1200w Modular PSU while im getting the card's

Thanks again

you don't need that much power but if you are willing to spend for....

your lepa has 54a on its 12v rail which is as much as my corsair 650w PSU. while you could probably run the GTX 580 in SLI with the lepa, its probably a roll of the dice for how long.
May 26, 2012 1:52:28 AM

Allright, There was a sale on overclockers and it worked in the same price as the Corsair Modular 850 power supply so i thought may aswell