DarkAngel
Guide
CA50 said:^ thats an eXtreme Power Plus PSU (RS-460-PCAR-A3), previously it powered my 8800gt without any issue
eXtreme Power Plus 460W (120mm fan) - Cooler Master - Leading Provider of Computer Case | Cooler | Power Supply
Cooler Master eXtreme Power Plus 460 W (RS-460-PMSR-A3) Power Supply Review | Hardware Secrets
It would be safer if you go for a PSU upgrade. At least get a Corsair CX430 V2 ~ 2.2k and if budget permits then a Seasonic S12II 430w ~ 2.7k.