Quote:
Originally Posted by ooogemaflop
nah ya just wrong
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If you'll look at the sticker on the side of any power supply, you'll see the ratings for the various voltages supplied. Modern PCs draw most of their power off of the +12V rails, so it's the total available current/power available on the +12V line that determines whether or not your power supply has enough capacity.
Take a look at the sticker on the side of a high quality PSU rated at 560 watts fro example.
46 amperes (552 watts) on the +12V rail is more than enough for any PC with a single graphics card, and it's good enough for mid-range two-card Crossfire/SLI set-ups, as well.
Anything over 30 amperes should be plenty for most single-card PCs.
A cheap junk power supply claims to be a "550-watt" unit (almost exactly the same as the 560-watt Performance PSU). It's really only a 400-watt unit, rated at 25 amperes (300 watts) on the +12V rail
