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#11
I just calc'ed the wattage THG did on various OC'd GTS 450s, including the Asus I am getting. The Asus peaked at 226w, that's 18.833 amps (226w/12v=18.833). My Antec 430w has 17a & 16a rails .. looks like I'll be fine with normal desktop usage, but I think it might struggle in 3D gaming.
AFAIK, current ATX PSU rail specs is limited to 240 VA. So the limit on a +12v rail is maxed at 20a (12v x 20a=240w), 5v is 48a (5v x 48a=240w), and 3.3v is 72.72a!!
I know the 5v and 3.3v max is unthinkable to reach .. but the 12v max is very close to the 226w of the Asus GTS 450. I am thinking of the Corsair 550w single +12v rail PSU.