AllHardwarezone has a review posted of this inexpensive heatsink for Athlon XP. Though you wouldn’t want to overclock with it, it looks to be a pretty good performer for a great price.
“Marketed as a product for computer users looking for a quiet cooling solution with competitive cooling capabilities, the WhisperRock performs exactly as Spire claims it to. While I wouldn’t recommend this cooler to overclockers, it is a fine cooler to put in any other computer. The build quality was great, it has an attractive look and it’s near-silent.”