If you want to know more, take a look at the
AMD Thermal, Mechanical, and Chassis Cooling Design Guide
The pages you want are most likely 11, 15, 16, 19, and 20 (these are PDF page #s, not the numbers in the corners of the pages). You might want to read the rest as well, though; it's pretty interesting stuff.
__________________
Everything aircooled

(I honestly don't know why you guys let me stay a member...

)
Always folding:
WXP Pro:
KD7R + Palomino 1800+
W2K3:
4x P3 Xeon 500 512KB (4 clients)
Linux boxes:
none

Had to put them to use doing *real* work.