I guess after posting at Evga my Ultra 600watt dual 12v rail psu isn't enough for these two cards. I load up supreme commander once the map loads the computer shuts off and the same with 3dmark 06 it shuts off at various times during test. So I guess the power isn't enough. Minimum 450watt @ 12v22amp rec 550watt @ 12v25amp. I don't think my amps are up that high I will have to look Sunday night at the box.