I buy an i7-860 with 4x4 Ghz , and Nvidia 460GTX and 6 Gb Ram ( 1600 or 2000 mhz ) , how strong should be my PSU? , are 650W enought? or would you say I need more , cus it's expensive and before sth. happens i need an PSU which surely handle it with energy.
In the absence of any competent technical reviews (i.e. with load testing, waveform analysis, etc.) at the very least a quality PSU will have full range active PFC (no little voltage switch) and be 80+ certified.
As delluser said, with one card, a quality 500W PSU will be sufficient.