Nvidia recommends using at least a 450W PSU with the GTX460. Knowing that Chieftec rates their PSUs at peak and not at steady load, I would recommend upgrading it to a Corsair, Seasonic, XFX, Antec, or PCP&C of at least 450 watts, more if you plan to overclock, or go SLI in the future
My complete specs
CPU: Core i5
RAM:GEIL 8GB (2x4GB) 2133MHz DDR3 EVO Corsa
Power Supply: Chieftec a120 chp500a 500w
Case:COOLER MASTER Storm Enforcer
and for HDD i dont have any idea...