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9800GTX SLI Power supply

post #1 of 7
Thread Starter 
I was wondering, perhaps I could go 9800GTX SLI later on when someone was tired of them and would sell them for a lot less 2nd hand. So I'd like to know what wattage PSU will do.

I am getting a 600 watt with 72amps on the 12v rails (which are rated 18amps each but I've seen em go up to 22amps). And if I can believe the PSU calculator (lite) then a 600watt PSU will do if I select the following things:

Q6600 G0 OC'd to 3.2Ghz with a 1.3vCore
9800GTX SLI'd
2 sticks of DDR2
One Sata hard-drive
One CD+RW/DVD+RW
Five 120mm fans and one 140mm fan.

That would be exactly 600 watt says: this... Though; can I trust it?
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post #2 of 7
First, that PSU has about 36A on 12v rails. For 9800GTX SLI, I will get a good 650w such as Corsair 650tx if you don't need modular.
Edited by linskingdom - 5/26/08 at 6:01am
post #3 of 7
It looks fine on the paper, but does it have 4x PCI-E connectors?

9800GTX's uses only a bit more than your cards, but they require so much power connectors for marketing purpose, so you might be better off with the 8800GTS's.

As for the PSU calculator, I wouldn't rely on it. From what I know it overestimates way too much. If it was correct, my PSU should've exploded months ago.
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post #4 of 7
I am running the Corsair 750W for my rig and it has never peaked power wise. You should be fine with a power supply that has 650W and one or two rails. Don't bother with the quad railed power supplies.
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post #5 of 7
Thread Starter 


That should be enough according you you then ?
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post #6 of 7
600 watts should be plenty. My rig down below only uses about 500watts draw under full load (3dmark06, Crysis, etc INCLUDING the monitor) so 600w should be good for you.

Only reason I have 1000w is so I can SLi later on, add more goodies, etc.
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post #7 of 7
Thread Starter 
Screw it, I'm getting it anyway. Ten euro's more expensive for 50 watts seems like a nice price. And the money I am saving for the setup with one card seems fine enough to vouch for it.

(Not getting the SLI right now, in time I will when someone offers one cheap on one of the many Dutch 2nd hand markets)
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