Go here: http://www.slizone.com/object/slizone2_build.html
Scroll down to SLI certified power supplies.
They are all over 500W.
will a antec 400 watt power supply be enough for my pc? Im running a AMD 3200, 1gig ddr dualchannel ram, 2 raid serial ata 100gb Hd's, 2 GeForce 7800GTX GDDR3 SLI video cards.