frag there no video card out there that uses 700w. the gpu vendors will say 600w power supply recommended so that there wattage and amps on the 12v line to run the gpu. google your video card and power requirements. most gpu online that are test will show there max voltage needed. for most high end crossfire or sli rigs a 850w power is needed. (games some time pick up a 1000/1200w unit if it on sale for the same price as the 850). also go for a cosair or a sesonic or a rebranded sesonic unit. a lot of power supply's out there are junk.