No problem! Sorry if I was rude...
My understanding of the situation is -- temp sensing in AMD Brisbanes is broken.
I don't have a Brisbane, so I cannot confirm or deny this, but that's MY understanding...
Personally, if it was me, I wouldn't worry about it... especially since SpeedFan is reporting your fan speed @ 675,000 RPM. Hello?!?!?!
You might consider using Everest Home Edition instead, but that isn't a cure-all... kinda ancient in computer years!
Maybe someone else will pop in here and set the record straight!