I recently purchased the an ASRock N68C-S UCC motherboard, because of the core unlocking feature. I put an AMD Phenom II X4 960T into it.
I can't find the option to unlock the 5th and 6th cores in the BIOS. I have seen videos where under "CPU Active Core Control" it has the "[All Cores]" option, but mine only has "[Enabled]" and "[Disabled]". After enabled I only have the option to disable cores 1 through 3 (5 and 6 are not listed, and 0 can not be disabled)).
I thought I might need to update the BIOS so I flashed to the latest version (P.160), but the BIOS settings look exactly the same.