Thermalright HR-07 Memory Module Cooler
 

The HR-07 is nothing like any memory cooler I have seen, and the double heatpipe design is quite foreign looking to me. The concept of the design makes sense though, and what you have is a heavyweight heatspreader with a heatpipe on either side that draws heat up to a pair of cooling fins that will be situated in the moving air inside a typical system.


http://www.bigbruin.com/2007/hr07_1

Still doesn't answer if DDR2 clocks better with this type of cooling.

seeing as most sticks run okay without heat spreaders without airflow at stock speeds, and with some airflow, overvolted, doesn't seem they will get much from extra cooling.

Not much changed from DDR1... subzero cooling your ram won't make it perform like crazy, unlike GPU/CPU with same cooling.