Xigmatek's SD1283 Gaia heatsink comes with a one 120mm PWM fan that operates at speeds of 1500RPM to 800RPM. The fan is mounted to the aluminum cooling fin tower with four vibration absorbing rubber posts, a second fan (not included) can be mounted to the rear of the heatsink since additional fan posts are included. The heatsink stands 159mm tall and has a footing of 120x77mm. It's a little less than exciting when great thermal performance is virtually assured by the 120mm fan/tower fin/HDT combination. Provided the heatsink is well made, some exposed heatpipe tower heatsinks are most definitely not.