3DMark'06 CPU:
XP 32b, Phenom at 2652MHz low NB/HT, loose timings, 2k6 CPU score:



Use it as a comparative as it's totally untweaked. I was testing low volts stability there with a low card.

And to update on Vista X64:
A user here is running 257x11 on 32b and 255x11 64b in Vista with Phenom and the MSI RD790 daily stable. ASUS RD790 needed more volts to run the same oc.
BUT, this user experienced behavior the same as my chips have done. Before his chip could not oc past 240HT at all, completely impossible for it to, would reboot with instability. Now, it goes much past fully stable, after many weeks of use.