Way I heard it, the "overdrive" benefited alot more than just the phenom cpus. Bringing an extra %age to a bigger number of previous `new` AMD cpus.
It could be since more people have gotten their hands on it and tested it, that it didn`t quite come to fruition, nevertheless, it sounds like a bread of cpus that are held back ? Can`t understand that.
Talking of beta releases, Windows 7 beta seems to have been leaked also. (not just the Windows 6 with patches that was also branded about)