I am going to refer you to this website. I can't see it at work.
If you don't find your solution, list all your hardware components and amps on the 12v raills of your power supply and we will calculate it for you.
Cooler Master Real Power M700 can easily run 2 XFX 9800GTX+ sli easily or not??
Currently running 2 of the Bfg9800GTX + on a Corsair TX750 with an I7 920 and lots of fans hd's ect ect.... Stable stable stable no issues at all. Not sure about your power supply but the corsair is 1 12Vrail and 60amps.