I looked through the thread with all the graphics cards and the suggested power supply wattage but I haven't came across the videocards I have on the way.
System with GTX590 single card needs, borrowed from EVGA;
"Requirements
Minimum of a 700 Watt power supply.
(Minimum recommended power supply with +12 Volt current rating of 50 Amps.) "
If you want to objectively, accurately and scientifically determine what PSU power is required for your Vid card and PC in both watts and 12v rail amps., the forum Utility link below will show you how easy it is to calculate this information and objectively determine which PSUs are quality built, reliable PSUs that can meet your needs. Be advised that the available 12v rail amps. is just as important as the total PSU wattage. You need both to be correct.