I just purchased a evga gtx 650 ti with 2gig gddr 5 sc, and am trying to use it in a EVGA 750i SLI FTW Motherboard. system has a evga 600w power supply. It has a e8400 processor, 4 gigs dd2, bios i750sz10. system was running a gtx 260 with no problems, When 650 is installed it posts to evga screen and then reboots the computer over and over any thought?