Mushkin Heatsink Preview
 

The thing that makes this quite different from the usual Mushkin design
is the circular holes along the top, which should aid in airflow, assuming
you have some form of airflow going across the ram area. BTX design will
most likely make more of an effect here. The holes appear to align with
the actual ram chips themselves, so that air can reach down the sides of
the chips.

http://www.viperlair.com/reviews/mem...kin/misc/rlhs/