Thats fine. Have a look at go.to/kt7faq and then click on link for heat issues. It states there that AMD say up 90 celcuis MAX. And it also lists somewhere giving you known temps for diff cpus with diff fans and heat sinks.
Are you getting instability? If so then it may be too hot, or you could have another prob.
I just install a thunderbird 700 and loaded 10 or so apps (like calc, paint, etc) and ran Quake 3 and UT and could play them...they were jerky but they played (I only have 128Mb PC100 memory) and the CPU temp went to 72 celcuis and it did not crash once.
hope that helps