To the OP, I have a gtx 470+650w PSU+95w processor. It runs pretty sweet at stock clocks. When OC'ing (cpu+msi afterburner) though, I would get random restarts in my games. I dunno if it was from the OC, cause it ran stable in prime 95 "blend" test overnight, or from PSU issues (470 min requirements:600w and 38a on the 12v rail). I dunno. I turned my overclocks off. And random reboots stopped. Like I said, I dunno. Just my experience.