make sure to tighten the clip on a 3dfxcool alpha(they ship the old style clip).
Also,
Duron temp reading is extremely flaky. DO not attempt to compare temp readings with other people on the bbs. Among other issues, Bios revision, thermistor placement are huge in the wide range of temps that people report for duron temps.
For example, you'll see people reporting 32C for a full load overclocked duron. Err, unless your ambient case temp is a cool 10-12C(under 50F), it isn't possible.
So, as long as the chip runs fine for you, i wouldn't worry too much about temp. The cores are rated to 90C.
Mike