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Any advantage using two power supplies?

post #1 of 20
Thread Starter 
Hi everyone. This is my first post. I've been using this forum as an information source for a few weeks and found it very intresting.

Can anyone tell me if there is any advantage using two smaller power supplies over one larger power supply. I'll be running two 580's in SLI and have two loops, one for the video cards and one for the motherboard. I thought there might be an advantage in quietness and the power for video cards being cleaner if I used say one Corsair AX750 for the video cards and one AX750 for the rest of the computer, motherboard, 4 D5's, bunch of fans, Aquero 5XT, Poweradjust 2's etc. I'm thinking if I have about twice as much power as I need when things are maxed out, the power supplies will run very quietly. Any advantage in two power supplies this way over one AX1200? Or any advantage with two smaller power supplies splitting up the load differently between them then I am currently thinking?
post #2 of 20
when you do not need all video cards, if you have attached a switch you can leave hardware off till needed if you set it up properly.
same goes for turning on things like Tec's or additional water cooling devices for benchmarking and such.
post #3 of 20
Quote:
Originally Posted by Forgotton;15469185 
when you do not need all video cards, if you have attached a switch you can leave hardware off till needed if you set it up properly.
same goes for turning on things like Tec's or additional water cooling devices for benchmarking and such.

PCIe slots supply power, I wouldn't recommend having a video card on a switch.
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RedCraze
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post #4 of 20
The SR2 has independent power for PCI-e slots beyond the first and has disable switches for them it's work and a bit of modding but could be done safely.


ahh, i made an assumption thought i was on another forum he is correct depending on what motherboard. Though the comments on additional cooling and such still apply.
Edited by Forgotton - 10/26/11 at 9:29pm
post #5 of 20
I've done it with 2 x 750 watt PSUs, but for no other reason than I couldn't afford the 1200 watt PSU that I wanted.
Quote:
Originally Posted by Forgotton;15469185 
when you do not need all video cards, if you have attached a switch you can leave hardware off till needed if you set it up properly.
same goes for turning on things like Tec's or additional water cooling devices for benchmarking and such.

I definitely wouldn't be switching on a video card, or anything else connected to the motherboard while the rig was running.

I doubt there would be any noticible benefit in any real life situation, apart from already owning two and not wanting to fork out for the AX 1200
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post #6 of 20
For a normal 580SLI system there's pretty much no advantages and you'll be better off with a single PSU. and the AX1200 is overkill.

Now if you were into LN2 benching with quad SLI, tecs etc. you might see some advantages.
 
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Benching
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post #7 of 20
if you could do better with single then there is no reason to buy two psu, and they will use 20% more power also due to lower efficiency
    
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post #8 of 20
Theres the added benefit of making your wallet lighter, if you count that as a plus (I wouldn't). And as said before, 1200 is overkill.
    
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post #9 of 20
First person to use 4 1500w units gets a prize of some kind.
    
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post #10 of 20
LoL I would too tongue.gif~ but the bill to get 2 220v lines installed in the rental we are in is just too much. darned electritions making $120 an hr. frown.gif
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