Sometimes heatsinks are little works of miniature art.... like this HP RISC processor/heatsink combination device.
The heatsink appears to be standard heat column with aluminum fins designed for a forced air environment, it's just interesting that HP have packaged the thermal solution and processor as one unit. This heatsink would make a great cooler for an Intel X48 chipset by looks of it. ;-)
FULL STORY @ EBAY (http://cgi.ebay.com/HP-440mhz-PA-RISC-Processor-A5522-04004-Hewlett-Packard_W0QQitemZ360048150933QQihZ023QQcategoryZ56092QQssPageNameZWDVWQQrdZ1QQcmdZViewItem)