What PSU for GTX580 SLI?

xxShinobixx · 16 Jan 2012 at 15:37

As title suggest what is the lowest i can go with PSU to power 2x GTX580 + the rest of the PC. Can i do this with good 750W?

Thanks

olivier renault · 16 Jan 2012 at 15:42

alledgely. You can always get one of these plug-in monitor (£15), run intensive benches (Unigine runs GPUs 100%), and see how close you are getting. If it's too much, get a 850W (or whatever you feel comfortable with) and sell the 750W.

I've found that the power requirements for SLI / Crossfire isn't as high as generally expected.

95thrifles · 16 Jan 2012 at 15:43

It would be on absolute limits really
For 99% of tasks you would be OK, as long as its a very good 750W, but I would expect you to get crashes under load, 850W is recommended and if OCing then 1000W would be my preferred choice

stueng · 16 Jan 2012 at 15:45

could you link said £15 monitor?

olivier renault · 16 Jan 2012 at 16:39

http://www.overclockers.co.uk/showproduct.php?prodid=NW-003-EN&groupid=702&catid=55&subcat=

I don't use that one, so can't comment how good it is. The one I use, I'm happy with it.

beejjacobs · 16 Jan 2012 at 16:42

Can I suggest something like:
http://www.overclockers.co.uk/showproduct.php?prodid=NW-003-EN&groupid=702&catid=55&subcat=
To monitor total power usage of the PC? Obviously this will be slightly more because of PSU efficiencies and such, but it will give a good idea of how much you use under load with one card.

RJC · 16 Jan 2012 at 17:37

My old system below will give a idea of wattage:

Yours might be a little less.

System specification:
CPU Intel i7 920 @ 4ghz
GPU: 1 X 580 GTX Ocuk STD
watercooling and 1 SSD, and 2 mechanical hard Drives, 6GB Patriot ram @ 1600MHZ
PSU: PC Power & Cooling 750w

Power Consumption:
Desktop Idle: 210w
Prime 95 load: 330w
Full load with Prime & Furmark: 500w

xxShinobixx · 16 Jan 2012 at 18:40

ok, thanks, will try and run some tests to see if i would need a bigger PSU.