When you get bit bit north of 60C running Prime 95 small ffts for 10 minutes using what other will recommend for an AMD chip (I'm intel). Over 62C under testing loads is the limit I read. I just can't say what proggy you need to use to measure accurate temps with AMD. Running a game or looking at the bios reading means little.
I do know we don't trust the Bios or mobo sensors. They suck. Manufact don't put a lot of money into that and don't take the time to release specs.
Hopefully an AMD expert will chime in and give you input.
If not, try OC Forums, the AMD forum is decently active.