AMD reps have come forward and denied any attempt to lock down clock rates on Phenom II cores, although the company will be putting out a microcode update to correct a Cool'n'Quiet bug that has been reported on just the Athlon II X2 model 250 processor. As Athlon II X2 is a pure dual-core die, there is no chance of "unlocking" hidden cores as there aren't any hidden in there at all.
Core unlocking, on the other hand, is seen by AMD as something that's relatively benign, enabled in BIOS through ACC and giving users a shot at adding a bit of performance on the side. Anyone would be "lucky" if they managed to unlock all the cores on, say, a Phenom II X2, said Antal Tungler, Technical PR Manager for AMD in Euroland
Amd denies locking down cores - The Inquirer
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