I read that the BFG 650w PSU has issues. It may work for you but there are better power supplies out there that are more reliable.
I googled and discovered that the 600w version of the BFG PSU has max. combined load for the +12v rails is 39A.
"The maximum combined load for the +12V1 and +12V2 outputs is 39A."
This is definitely enough for your video card but if you can find a more reliable PSU for the money, do consider it. BFG video cards are great but I'm just going by what I found via google (i.e. people's experiences with the BFG power supplies). Also, a lot of it is based on opinions so YMMV.