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HD 7770 or GTX 650 vs 450 watt PSU

Last response: in Graphics & Displays
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12 volt Amps or combined wattage rating for multi-rail please?

I have a GTX 650 ti(with undervolted i5 750) on a 300 watt power supply :) . But its all depends on

A. The current the power supply can deliver at 12 volts(power supply quality)
B. The rest of the system. In my case it is mITX(SFF) so it is very low powered.
!