That board is known to missread cpu temps. The best test for heat is crashing. If you can run folding@home for 3 days without crashing, your temps are fine.
This may be a shameless attempt to get you to join our F@H team, but it will tell you if your system is overheating. (Of course running prime95 would do the same thing, but then you wouldn't be helping save humanity at the same time)