"The CoolViva features a copper base with three copper heatpipes that run the length (top to bottom) of the heatsink. The pipes cross through aluminum fins to dissipate heat. The radial fan forces air through the fins by blowing air from front to back and then out through the rear of the case using the vented riser plate. The fan shroud is not directly connected to the riser vent however and rather than forcing the hot air out the back of the case as some cooler designs allow for, the CoolViva is just blowing the air in that direction."
FULL STORY @ OCIA (http://www.ocia.net/reviews/cmcoolviva/page1.shtml)