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2 x 8800GTS 320GB - 650W PSU Enough?

post #1 of 7
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Hi All,

I have a 8800GTS 320MB ready to be put into my machine, But am thinking to SLi 2 of them. I have a Coolermaster eXtreme Power 650W PSU And i was wondering if this was enough or whether i would need maybe a PSU with a high wattage? Since one 8800GTS requires 400W?

Hope to hear from you soon.

Thank you.

Air_Storm.
Air_Storm
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Air_Storm
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post #2 of 7
It would help to know which brand and model of card you have. Peak power for an 8800GTS 320MB can be as high as 300W @ 12V, that is 25A. Two of those puppies and you're talkin 50A peak and 30-40A idle. Even an optimistic estimate would put peak power at 40+A. I hate to say it, but your PSU is not capable of doing this since it has dual 12V rails at 18A max each. I recommend getting a single rail PSU with 60A rating such as the PC power and cooling 750W or silverstone. The PSU is one of the most important pieces of your system, so dont skimp on it. HTH.
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post #3 of 7
Suck it & see.

If it reboots remove the 2nd card & go get yourself a bigger PSU IMO..
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post #4 of 7
What about one of those thermaltake toughpower 650 watts? Could that hande 2 8800 GTS 640mb?
post #5 of 7
Quote:
Originally Posted by wire View Post
What about one of those thermaltake toughpower 650 watts? Could that hande 2 8800 GTS 640mb?
im running a thermaltake 680 watt with two 8800gts 320mb. Its my signature rig+ 7 120mm fans wide open ....works fine.
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post #6 of 7
Quote:
Originally Posted by sti_boy View Post
It would help to know which brand and model of card you have. Peak power for an 8800GTS 320MB can be as high as 300W @ 12V, that is 25A. Two of those puppies and you're talkin 50A peak and 30-40A idle. Even an optimistic estimate would put peak power at 40+A. I hate to say it, but your PSU is not capable of doing this since it has dual 12V rails at 18A max each. I recommend getting a single rail PSU with 60A rating such as the PC power and cooling 750W or silverstone. The PSU is one of the most important pieces of your system, so dont skimp on it. HTH.
me thinks you've got it wrong, nvidia suggest a 400w power supply with 25A for the whole system, one 88gts can never pull 300W, first off, it gets power from the bus, thats 75W and it gets power from a single pci x cable, thats another 75W, which means the most it could pull is 140W"staying with regulation" it only pulls like 120w to my knowledge. So the card only pulls like 12amp's


wattage doesn't matter, amps matter, but how EE it is it and at what temp did they test it in.
Example: a power supply is 80%EE at a temp of 15degrees c, that means its never ever going to give you 80% because in your case it'll be alot hotter, dropping the EE of the power supply.(don't know why is i said that)
post #7 of 7
It should handle it fine.

PCP&C Silencer 610W handles GTX in SLI as well.

But honestly, I've never red good reviews on CoolerMaster PSUs.
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