FrostyTech posted a review on the Coolermaster Vortex Plus Heatsink

The Coolermaster Vortex Plus heatsink stands 83mm tall, in total. A 25mm thick, 92mm PWM fan exhausts downward so waste air impinges on a lower extruded aluminum heatsink that sits atop the processor. It's both a good use of space for additional cooling surface area and an admission by heatsink designers that the aluminum fins above aren't getting the whole job done by themselves.

Coolermaster Vortex Plus Heatsink Review