What voltage are you pushing to the cpu, what cooling are you using, is it in a cramped case, did you do any wire tending to make sure airflow is good, etc. These are all things that could cause high temps with nothing being wrong at all with the mobo or temp readings.

On the other hand I am going to have to flash to 602 to see if that corrects an incorrect reading of my Xeon 3075's temp as 2C. Haha, I wish I could achieve that with simple air cooling. So it could be the bios version you have reading temps wrong. Check all the things I mentioned in the first paragraph first though since if that's all jacked then a bios flash isn't gonna help you anyway.