I am thinking about SLI-ing two Galaxy GTX460s (768mb) to help bump FPS in BF3. I have a 500W Antec 80+ Earthwatts PSU. Will that be enough? I am also running three SATA drives, a dvd drive, i7-2600k, and a wifi card.
I wouldn't crossfire the 768 MB version if i were you, and i would get a single high end GPU such as the GTX 570.
and no, the 500W PSU is not sufficient for the SLI, the GTX 460 768 consumes 250W @ full load.