I have a Phenom II 550 in this mobo, which came with F1 bios. After downloading AMD's overdrive I unlocked the remaining cores and they showed up in ACC. After flashing to F2 They no longer show up as unlocked. Cpu-z reverted to AMD Phenom II x2 550 from x4 B50. This seems to be backwards from all I have read on the subject. The multiplier showed 4 cores on F1, but only 2 with F2. If I am missing something would someone please enlighten me?