My full system specs are.
Motherboard - Asus Crosshair (am2)
Cpu - AMD 9950 Black Edition
Ram - 6gb Kingston pc26400 (400mhz ddr2)
PSU - OCZ zs750 (750watt)
Hdd - 1tb hitachi & 2tb western digital Green
Gpu - Radeon x1650 (DONT LAUGH AT ME ....)
Cooling - Corsair H60 w/two 120mm antec 3 blue led fans installed on rad. I also have two 120mm antec 3 fans in my case,I also use the voltage cooler fan that came with my motherboard,my power supply has one 120mm fan inside & i have a 80mm arctic cooling f12 installed on my wd hdd.
I'm pretty sure that my power supply can handle two gpu's, however I'm not even sure if I need two. I play allot of high end games ( not recently due to my x1650) I had a gtx 260 install for the longest time and one day I heard a LOUD pop/bang? I realized that one of the voltage regulators on the card literally exploded and bent the casing around the fan. I have no idea what would cause this I even called xfx and they did not believe me!!! anyways yea lol...