I'm building my new computer right now to hold me over until Bulldozer and I purchased the NF750-G55 and a Phenom II 955. The CPU worked right out of the box with the motherboard, but when I tried to overclock it through the BIOS, all the Voltage options were grayed out. I flashed the BIOS to the latest version and the same thing happened. So, I tried disabling Cool n' Quiet and no go. I didn't see anything that I had to enable/disable to allow voltage adjustments, but it's possible I missed something.