The RCX-Z3 features no less than six copper heat pipes, a
very thick copper base, 52 thin aluminum fins, a small extruded aluminum
heatsink, and four strategically placed blue LEDs for internal
illumination. Three interchangeable base plates allow the Rosewill RCX-Z3
heatsink to be installed on a variety of motherboards, while its' 92mm PWM fan spins
at speeds of 600 to 3000RPM. According to our real world sound measurements
that translates into noise levels of approximately 58.6 dBA to 45.6 dBA.
FULL STORY @ FROSTYTECH (http://www.frostytech.com/articleview.cfm?articleID=2130)