(adsbygoogle = window.adsbygoogle || []).push({}); Would a 650W PSU be enough if I were to crossfire 2 radeon 6850's?

Specs:
Intel i7 2600k
Asus P8P67 LE
Corsair H60 water cooling
8gb ram
1tb caviar black WD
4 case fans
mouse
keyboard
SyncMaster 2233BW