Are you sure that's correct? My Athlon 1000 (Thunderbird) at work runs at 34-35 C using a Thermaltake Volcano 6Cu heatsink/fan (with some cheap white grease). My IBM 60 GB hard drive is much hotter (54 C IIRC).
[link|http://www.pcstats.com/articleview.cfm?articleid=1162&page=2|This] page measured 53-54 C for AthlonXPs with 2000+ and 2100+ ratings.
Cheers,
Scott.