<< You should never worry about anything under 50 deg. C.
Hell, I was running a K6-2 350 at about 65 deg. C. for 18 months, and it still lives (i have added a case fan now... 😉) >>
Just keep in mind that any software you use to monitor this will not be 100% accurate! i use a thermal probe and software is always 6c cooler. So be carefull. If you are on the edge, you may in fact be over it. But AMD says you can run hotter, but I still don't beleive them! 😉