When it happens, close crysis and open furmark and start a benchmark. Look on the right side and tell me if your clock speeds are still at what you set them too.
You could also try a new driver. How long ago did you start playing the game and what is the longest amount of time you have played without any problems?
Is there any patches available for the game?
And by the way, that TMPIN#2 does not seem to be right at all. It sits at 81c as a dual core even if I'm idling at 26c. I always ignored that temp because it just stays that way, always.