Having issues booting Win7 x64 with multi x50 and above. It will stuck at win logo most of the times, randomly. Somehow can boot everytime into WinXP x64 til x54. Hmm either buggy bios or Win7 need a patch for 5Ghz+. Another issue is my dram is not natively support for P67 mobos. Cant do 2133Mhz on UD7, but Maximus is doable.