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GTX 480 vs PSU

Last response: in Graphics & Displays
September 6, 2010 11:56:11 PM

Hey guys, had a quick question about the requirements for the gtx480. I guess I'm just a bit confused as far as amps go. I'm seeing from the nvidia site that the card has a minimum power supply requirements of 600W, which I have surpassed with my Antec 650W psu, but as far as amps go, the card requires a minimum of 42Amps, and that's where I'm stuck. My power supply is as follows...

+3.3V@25A, +5V@25A, +12V1@22A, +12V2@22A, +12V3@25A, -12V@0.5A, +5VSB@2.5A

Since the card uses two pcie power connecters, would I simply add 22A +22Ato determine if my psu gives out enough power? OR should 42Amps be just for one connecter?

Thanks in advance,


More about : gtx 480 psu

a b U Graphics card
a b ) Power supply
September 7, 2010 12:15:01 AM

NO, you do not simply add them. Somewhere on the PSU sticker it should say a combined 12V rails wattage. Simply divide that by 12V and you have your combined 12V amperage.
a c 355 U Graphics card
a b ) Power supply
September 7, 2010 12:17:14 AM

The GTX480 itself will not use 42 amps. That the minimum recommendation for the entire system. Your PSU will be fine. I think the GTX 480 consumes about 160w - 170w under full load. Too lazy to check power consumption charts at the moment.

BTW, the PSU can provide a max of 540w on the 12v rails alone. Just try not to max out your PSU. That's the best way to shorten it's lifespan.
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a b U Graphics card
September 7, 2010 12:17:24 AM

You definitely should upgrade your power supply to something more viable for an entire system + the gtx480

But i believe that if one rail isn't enough the power supply will use DC to DC via like a circuit breaker setup (i don't know much about electrical) to give more power to another rail (though lowering efficiency).

And 160-170

how about 160~300

His system will break 600w easily - depending on what else hes got goin in there

Best solution

a b U Graphics card
a b ) Power supply
September 7, 2010 12:17:33 AM

And it does: Combined 12V (Rails 1, 2 and 3) Wattage: 540W

540W/12V = 45A

Just sneaks by, but that is an exaggerated req. What are your other system specs?
September 7, 2010 12:24:44 AM

It does seem to be cutting it close. My pc specs are as follows..

PHenom II X4 955 BE
3.72GB ddr2-800
Antec EW 650W
Samsung 160GB - 7200RPM sata
Corsair H50
HP Dvd1170 Optical drive
and Antec 900
a b U Graphics card
September 7, 2010 12:28:10 AM

thats not bad, you might be right at 600 or ~ 550 @ load
a c 355 U Graphics card
a b ) Power supply
September 7, 2010 12:29:36 AM

You're fine as long as you don't attempt to connect everything to a single 12v rail.
September 7, 2010 12:32:31 AM

Thanks very much to the both of you, much appreciated :) 
September 7, 2010 12:32:53 AM

Best answer selected by zodiac949.
a c 271 U Graphics card
a b ) Power supply
September 7, 2010 12:34:35 AM

This topic has been closed by Mousemonkey