FrostyTech posted a review on the Rosewill RCX-Z2 Heatsink

The Rosewill RCX-Z2 heatsink is designed for socket 775 Intel Pentium D and Core 2 Duo processors, and as with most heatsinks vying to push the stock Intel heatsink out of the PC, it comes equipped with a Pulse Width Modulation (PWM) fan. The fan on the RCX-Z2 spins at speeds of 500-3400RPM, and is internally illuminated with blue LEDs.

Rosewill RCX-Z2 Heatsink Review