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Graphics card power requirement help

I want to buy an Nvidia Geforce GT 630 1GB DDR3. Unsure whether my current power supply unit will do.
PSU specs:
450 Watt
25A@+5V, 10A@+12v, 14A@+3.3v, 1.5A@+5vSB
The Nvidia website says that minimum wattage of PSU should be 300W (and I have 450W). But many forums say that minimum 20A must be there on the 12v rail (and I have 10A). i'm confused.
if possible suggest a cheap external power supply unit for graphics card.
3 answers Last reply Best Answer
More about graphics card power requirement
  1. Your PSU will not run a GT 630

    A GeForce GT 630 - needs at least 20A on the 12v rail and a 350W PSU

    The Amps on the 12v rail is the key.
  2. Best answer
    ramanujan said:
    I want to buy an Nvidia Geforce GT 630 1GB DDR3. Unsure whether my current power supply unit will do.
    PSU specs:
    450 Watt
    25A@+5V, 10A@+12v, 14A@+3.3v, 1.5A@+5vSB
    The Nvidia website says that minimum wattage of PSU should be 300W (and I have 450W). But many forums say that minimum 20A must be there on the 12v rail (and I have 10A). i'm confused.
    if possible suggest a cheap external power supply unit for graphics card.


    Hi - You are encountering the issue with older PSU designs that put a lot of the PSU's total capacity on the
    +5v & +3.3v rails. The problem with that is, your CPU, GPU, HDD, etc draw their current from the +12v rails.

    So, it's as Blackbird says above, you are way short of the +12v amps needed to run a system with a gt630.
  3. Thanks all of you for the quick help. :-)
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