The fan uses one ball bearing and one sleeve bearing. This is cheaper then using two ball bearings, but still works better than just using sleeve bearings. Four screws hold the 3500 RPM fan in place above the staggered fins on the Cho-Liang heatsink.

The clip mechanism works on a cam system which is very similar to that of the stock Intel heatsink. We can see the shallow cross cuts from this side which help with airflow within the heatsink. The outside of the cooler and all the fins are finished smooth, which is not always best for creating air turbulence and improved thermal transfer. This heatsink only works with the socket 478 retention mechanism.

Heatsink Base:

Remarkably the base finish is pretty flat. For an extrusion heatsink which has not been machined this is somewhat surprising. Generally, raw extrusions are wavy or slightly concave on the base. A good quality thermal compound is always recommended however.