To uninstall video card drivers, use add-remove programs first. Boot into safe mode and then use DriverCleaner program to remove nVidia driver remnants. Then reboot into regular windows and install latest official nVidia Forceware 93.71 drivers. Reboot as necessary or directed. You may be right about not having the 20/24 pin PSU connector connected to the MB. Try replacing your 430 with the 600 and see what happens. Even so, the 600 is still too weak for your entire system with that GX2 installed. You might try the 600 for the whole system with a less demanding video card, but then you would have to clean the drivers again. As for the recommended Vcore for your CPU, I've seen it listed anywhere from 1.25 to 1.35 volts. My MB defaulted to 1.3 volts. I would recommend you set yours to 1.35 just to be on the safe side. I've seen several sites list 1.35 as the default. That is what I used to use when I ran mine at 2400Mhz. I now use 1.485 volts for 3200Mhz, but I have very good air cooling. My system idles at 25c and only occasionally hits 30c-31c under extreme full load. Yeah, good point about the PSU synchronization. Both brands of video card PSU's that I've used have connections with the system PSU of some kind or other.