AMD banned ACC core unlocking on all 7 series chipsets too. Remember a short while after people discovered core unlocking, AMD notified all board makers to release a BIOS update to disable the functionality? Then what happened? One board maker (Biostar) ignored their demands and soon every other mobo maker followed.

If Asus can do this, this means the functionality is still in the southbridge, and that means it's only a matter of time before every board maker has the functionality implemented again.