stock settings unstable after longtime overclock!

[Capt Proton]

Don't they need to be auto for the cool 'n quiet to work, in order to allow it to dynamically throttle the voltage? This is a feature I want to use.

You are correct. Just read some stuff today about burn in, and the consensus is it is a myth. I mention this as you are talking about the same kind of thing, just in reverse. I think oc newbie might be onto something. If I had to guess, I'd say it isn't the CPU. did you install the AMD driver for the CPU?