Arctic Cooling Freezer 64 Heatsink
 

It takes just one look at the Arctic Cooling Freezer64 to realize it is not a standard heatsink. Arctic Cooling uses heat pipe technology able to transfer up to 200 watts to 40 fins. The patented fan holder is said to almost eliminate the "buzzing" sound commonly experienced with 80mm. box fans.

Link: http://www.short-media.com/review.php?r=280