" While the Igloo 5620 PWM heatsink ships with one 92mm fan capable of operating at 2300-800RPM, additional fan clips are supplied for a second user-supplied 92mm fan to be installed if desired. The base of the heatsink makes use of exposed heatpipes to leverage the rapid heat conduction qualities of these thermal devices. Given the relatively compact height of the Igloo 5620 PWM heatsink, it should fit into a good variety of PC cases which are off limits to the vast number of +160mm tall heatsinks. "

Frostytech