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Power supply question about 7900gto

Last response: in Graphics & Displays
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June 18, 2009 2:57:36 PM

Hi, on my psu it says: +12V1 = 18A , +12V2 = 18A, and under it it says 385W MAX. Its a 585W power supply from safe power. Does it mean that it can handle all cards below 18A+18A= 36A? Is it enough to run a 7900gto, and if not what cards can it handle?
a c 271 U Graphics card
a b ) Power supply
June 18, 2009 3:14:04 PM

A 7900GTO is pretty much a detuned 7900GTX which by todays standards is not a very power hungry card, I would still have reservations about using a cheapo generic though.
June 18, 2009 3:20:17 PM

hmm the card requires 22A on the +12v but i have two 12V with 18A, is it safe to say that I have 36A or do I need a power supply with a 22A on a single +12V
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a c 271 U Graphics card
a b ) Power supply
June 18, 2009 3:38:02 PM

Whilst my maths skills are crap I do know that you can't just add the rails, it is not 18A + 18A = 36A, it's probably closer to 28A - 29A. It' s more a question of, how old is that PSU?, and can it actually supply what the sticker on the side states it that it can?
June 18, 2009 4:00:00 PM

power supply is brand new, the mobo and stuff are pretty old so it wont draw too much power from the psu
a c 179 U Graphics card
a b ) Power supply
June 18, 2009 4:24:10 PM

Do n't bet on older tech not drawing much power, the Prescott Pentiums were notorious power hogs and some of the earlier X2 Athlons could chew through 120W with ease.
Mousemonkey is right about the 12v rails, according to the specs you have given the maximum combined output of 385W equates to 32 amps (amps=Watts/volts and 385/12 is 30.083... amps).
According to this site the card draws about 90W:

http://forums.atomicmpc.com.au/index.php?showtopic=264

Even assuming a heavy CPU draw you'll be just fine.
As long as the label is telling the truth.
a c 271 U Graphics card
a b ) Power supply
June 18, 2009 4:35:29 PM

coozie7 said:
Do n't bet on older tech not drawing much power, the Prescott Pentiums were notorious power hogs and some of the earlier X2 Athlons could chew through 120W with ease.
Mousemonkey is right about the 12v rails, according to the specs you have given the maximum combined output of 385W equates to 32 amps (amps=Watts/volts and 385/12 is 30.083... amps).
According to this site the card draws about 90W:

http://forums.atomicmpc.com.au/index.php?showtopic=264

Even assuming a heavy CPU draw you'll be just fine.
As long as the label is telling the truth.

:o  I could not remember the formula so I guessed at that without using a calculator, just a skinful of beer!
June 18, 2009 4:35:39 PM

yea i'll give it a try. thanks guys
a c 271 U Graphics card
a b ) Power supply
June 18, 2009 4:37:22 PM

No worries, I'm off to get some more beer. [:mousemonkey:3]
!