It's not unstable. It's downclocking itself to 800MHz to save power when you aren't putting it under any strain. Try putting a heavy load on it and you should see it go to 3.2GHz and stay there. If it were unstable, your computer would be freezing or crashing.
I suspect you've made errors in your BIOS choices.
I'd reset your bios to the original settings.
CnQ really isnt a bad thing, but if you want to alter the BIOS make sure it doesnt have you stuck @ 800Mzh
im having the same problem after using amd fusion, i get stuck with a x 4 multiplier on ma phenomII 955 resulting in 800mhz x4 i have c1e and c&q disabled, the fact is my bios settings are being completely ignored, ive tried altering my power management options, also to no avail.
the only way i get my 3.2 back is through amd overdrive, i cannot effect any changes to my cpu via my bios, so it seems.
i had my own post on the subject i also have the M4A79 deluxe with bios3501
i have win 7 64bit. did u find a solution nini?
i fixed my issue with asus board by brining my bios up to date, the 955 wasnt fully stable before a certain bios resulting in the multiplier dropping to x 4, if u got this issue check to see if the 955 is compatible with your version of the bios. if this helps anyone i am very happy, i found it really frustrating with everyone saying it must be c&q or c1e despite me stating that wasnt the case. gl