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2x GTX 580's on Seasonic X-650?

post #1 of 14
Thread Starter 
Phaedrus' calc says I'm good to go as long as I don't plan on OCing w/volt mods. Sounds awesome. I'm just curious, however, if it matters whether or not the 580's have a ref or non-ref cooler. I'm looking to run two 580 Lightning's in SLI, and I just want to make sure that they don't draw any more power than a ref 580 would. Also, I know the Lightnings come overclocked, but are they voltage modded to achieve that? If so, I'd have to upgrade my PSU to 750w or pick a different card :-/

Hoping for some good news here
    
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post #2 of 14
It is really pushing it with the 650, over power draw sometimes. Seasonic is one of the best but it is still pusing it. 750W for 2 580's is recommended as a minimum. For heavily overclocked ones, 850W.

You do not need to have the voltage increased to raise wattage. When the core frequency is increased, more current is pulled by the cards at the same voltage. Sometimes overclocked 580's will pull 30+W each.
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post #3 of 14
try it and see if it works.

If not, PSU will just switch off and nothing gets hurt.
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post #4 of 14
Thread Starter 
Quote:
Originally Posted by AMC View Post
It is really pushing it with the 650, over power draw sometimes. Seasonic is one of the best but it is still pusing it. 750W for 2 580's is recommended as a minimum. For heavily overclocked ones, 850W.

You do not need to have the voltage increased to raise wattage. When the core frequency is increased, more current is pulled by the cards at the same voltage. Sometimes overclocked 580's will pull 30+W each.
Yeah, it recommend 675watts, but it does list the X-650 as a recommended PSU. If I leave "voltage modded' unchecked it's fine, but "voltage modded" checked makes it 725watts. I was just asking because of that :-/

I know it is pushing it, but if I could get away with not having to spend even more money, I would. I guess I will buy one 580 and an X-850, then when the funds come, I'll buy another 580. Probably the best route?
    
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post #5 of 14
Thread Starter 
Quote:
Originally Posted by wumpus View Post
try it and see if it works.

If not, PSU will just switch off and nothing gets hurt.
But then I would have to either not use a $500 card, or spend another $200 on a PSU. I'd rather know in advance
    
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post #6 of 14
Quote:
Originally Posted by karmuhhhh View Post
Yeah, it recommend 675watts, but it does list the X-650 as a recommended PSU. If I leave "voltage modded' unchecked it's fine, but "voltage modded" checked makes it 725watts. I was just asking because of that :-/

I know it is pushing it, but if I could get away with not having to spend even more money, I would. I guess I will buy one 580 and an X-850, then when the funds come, I'll buy another 580. Probably the best route?
I honestly wouldn't risk it. Click the link in my signature. 570's without running furmark will pull a bit under 650W. So if you downclock the cards and only game and not bench, you may be fine. But who buys lightnings to downclock
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post #7 of 14
with an oc i7 a gxt260 and 570 folding maxxed out... My system draws 385 W so you'll have more than enough juice... i usually draw less power while gaming... My 2 cents
post #8 of 14
Thread Starter 
Quote:
Originally Posted by AMC View Post
I honestly wouldn't risk it. Click the link in my signature. 570's without running furmark will pull a bit under 650W. So if you downclock the cards and only game and not bench, you may be fine. But who buys lightnings to downclock
Bleh

Well, thanks for the info! +Rep for all the help. Looks like I'll get one card for now, enjoy it, then upgrade to SLI and PSU when the time comes
    
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post #9 of 14
You need a 750W for that.... 2 580s draw a LOT of power. Don't believe me, then contact Pheadrus.
 
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post #10 of 14
Anytime good luck and give us the results !!
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