Features. Minimum of Noise The buffered-mounted 92mm PWM fan guarantees sufficient cooling at lowest noise. With the combination of the patented fan case low noise impeller & vibration absorption the Alpine 64 PRO Rev.2 generates a maximum of 0.4 sone at full speed. Easy installation Thanks to the user-friendly design of the Alpine 64 PRO Rev.2 it can be installed with a few simple steps. ARCTICs acclaimed thermal compound of ARCTIC MX-2 has been pre-applied so that the entire installation process is quick & simple..