Very loud, but not constant

I've had my PowerMac G5 for about a year and a half now. Recently, it's been performing very loudly, but not constantly. I know there are dozens of topics about loud G5s, but I didn't catch any that were not a constant loudness.
It performs beautifully, and is very quiet most of the time. If I leave it on and go read a book, for instance, it will stay quiet, so it's only when I am using it. I'd say it occurs every 15-20 minutes or so, where the fans really kick in and things get pretty noisy. My CPU temp. is at a constant 77-80 (or so my widget says), so I didn't think anything's wrong.
Just checking to see if this sounds normal. Sometimes it's as little as using Safari and listening to iTunes. Doesn't have to be rendering video or anything.
Appreciate any help.

I'm not really sure what any of the
three settings mean specifically.
DP PowerMac G5 Power Management Explained >>
-Bmer
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