i am running 2 6950 crossfire at the moment on my pc with a 700w psu some people say its fine and some people are saying they wouldnt chance it im a bit worried that it will harm my pc is it ok or should i just keep with one 6950 2gb i dont have money for another psu i have used thermaltake calculator and it says everything runs at 575w yet ive heard from people i need 750w for crossfire with these cards im confused, i am not overclocking anything
You should be fine. The wattage calculator usually tells you power you will use and the 700w on your PSU is max power. Normally a descent power supply will be "Certified" and tell you a percent like 80%. You take the max rated output 700w and multiply it by the percent 700 x .80 = 560. So a 700watt PSU rated at 80% is guaranteed to generate a continuous 560 watts. While you are close to this number, as long as you have a descent quality PSU you should be just fine.