OCZ Hints at Radical Approach to Heatsink Design
 

The design of the Flexpipe heatsink revolves around a heatpipe that transfers heat from the module to another heatsink one centimeter above the memory bank. Air can pass freely under and over the heatsink bank -- an approach that allows air to move over the heatsinks of multiple modules when installed on a motherboard.

http://www.dailytech.com/article.aspx?newsid=5662

Goodbye clearance around the socket, if you have a larger CPU HSF you will most likely run into fitting problems.