No. those cpus run warm. I had a 750 up to 90c briefly and windows still ran. I don't recommend the stress programs unless your system is loaded constantly. They're unrealistic for real world applications. Use a simple monitoring program such as coretemp and run your games and programs for awhile and see how high the temp reaches. And you are correct about not messing with the cpu or heatsink. If it works, leave it alone.
Thanks o1die. I'll take your advice and not mess with it further. I have read so many conflicting things on the Internet over acceptable load temperatures, and I don't know how much of it is truth and how much is just boasting.