5970 is overkill if you play only Wolfenstein ET lol ..but if you like to play All Maxed real games, like Crysis,
Far Cry 2 and something else what rly needs power, then its ok .. If i trust internet information, 5970 needs 50A(mps) -> 12v rail (600w psu =minimum); So if you have more than one 12v lines, you need to be sure both lines give more than 25A(mp) in 12v rail..Single 12v amp rail is awesome in here, only you need to know is how much it gives Amps in 12v rail, but this information just in case :] Good Quality 800w psu should be able to make 50Amps, better check it on your manufacturer website. If you buy Razer, why not buy Razer keyboard? :] Razer for players :]
[PSU 12v rail source http://forum-en.msi.com/index.php?topic=104805.0;wap2 ] -Sokas*