I want to buy an Nvidia Geforce GT 630 1GB DDR3. Unsure whether my current power supply unit will do.
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.