FrostyTech has posted a review on the Arctic Cooling Freezer 64 Pro Athlon64 Heatsink

The Freezer 64 Pro suspends its 2200RPM fan on four dualaxial rubber vibration absorbing posts. The general idea of which is to prevent any motor vibrations from transferring to other areas of the chassis which might create noise. The 92mm fan itself is pretty unique in that the design minimizes turbulence and noise created by air moving over the edges of the frame.

Arctic Cooling Freezer 64 Pro Athlon64 Heatsink Review