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GTX 480 vs PSU

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,

10 answers Last reply Best Answer
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  1. 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.
  2. 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.
  3. 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
  4. Best answer
    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?
  5. It does seem to be cutting it close. My pc specs are as follows..

    ASUS M4A78 PRO
    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
  6. thats not bad, you might be right at 600 or ~ 550 @ load
  7. You're fine as long as you don't attempt to connect everything to a single 12v rail.
  8. Thanks very much to the both of you, much appreciated :)
  9. Best answer selected by zodiac949.
  10. This topic has been closed by Mousemonkey
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