The new Asus Arctic Square heatsink Frostytech is testing out for you today consists of an array of nickel plated aluminum fins wrapped around a 92 mm fan that is set within the body of the heatsink. It's a simple arrangement of fan and cooling fins, but one that draws cool air into the heatsink and expels warmed air out the other side. Noise never becomes much of an issue with this heatsink because the fan impeller does not rotate more than 2300RPM.