DaMulta: Your NB speed is too high you'll need to drop it down before you oc from the BIOS to really get to your limit. And use AMD OverDrive to OC aswell. Otherwise you're going great.

My max HT ref with Phenom is 265MHz:
http://valid.x86-secret.com/show_oc.php?id=279946
http://valid.x86-secret.com/show_oc.php?id=276606

Max valid HT and NB is 2160MHz: http://valid.x86-secret.com/show_oc.php?id=280790

Anything above that NB speed does not validate repeatedly.

Max valid/benchable (before 3 days) was 2849MHz: http://valid.x86-secret.com/show_oc.php?id=280406

The max CPU speed now is about 2.53GHz and max fully stable is 2.2GHz. I can run anything up to 2.53GHz quite easily but even after all load testing is passed.. suddenly whilst browsing the system will lockup, so I can't call it stable. No more is possible yet and I've tried at least 18 times. Very very strange behavior, a) max on everything is dropping b) CPU VID and so the wattage/heat has gone up c) day by day it requires more and more voltage for the same frequency d) vdroop has increased by the day e) instability has increased day by day to only 2.2GHz being stable f) lockups have increased dramatically g) oc limit has decreased by a long margin.
I don't know what to make of it. First time experiencing this, ever.