Also, that 650watt psu is awesome, it has 3 12v rails with 19amps each; here are the stats:
+3.3V@24A,+5V@24A,+12V1@19A,+12V2@19A,+12V3@19A,-12V@0.8A,+5VSB@3.0A
Please, someone correct me if I'm wrong, but that PSU is plenty for an SLI and OC'D Intel C2D rig.