I had to use XP on a Asus P9X79E-WS board. I have the BIOS set to 6 cores for the 4930K. I am switching between a disk with XP and one with Win 7. The Win 7 OS reports 6 cores and 6 threads. I can't get XP to report more than 2. Any way I can get it to 4 cores, even if I can't get all 6 under XP? Thanks.