Idle general use it for over 3 days before you call it stable. Higher end above 2.55GHz, Phenom suffers from random freezes after 1-3 days use with most users.

I've tested 2.76GHz 1.3V stable, 24 hours but after 2 days and sometimes after 3 hours uptime, it will randomly freeze. Even 1.55V will not make it stable. 2.691GHz is best stable so far and you need 1.502V for it but 1.28V for P95 24hrs stability test. Big difference.