Your board is probably fine. If anything is overheating, it's probably the video card or power supply. I would run your system for awhile, and monitor the temps. Trust me, if your cpu had actually reached 99c, your system would have had bluescreens or froze up. It's probably a glitch with speedfan.
Exactly what I was thinking; But I still can't think of the possible loss in performance in games? Hm.
Thanks for the reply.