Pretty "cool" if you ask me!
http://www.extremetech.com/computing/131656-the-fanless-heatsink-silent-dust-immune-and-almost-ready-for-prime-time
http://www.extremetech.com/computing/131656-the-fanless-heatsink-silent-dust-immune-and-almost-ready-for-prime-time
Quote:
In the Sandia Cooler, the heatsink itself is the fan. It is a cast metal impeller that floats on a hydrodynamic air bearing just a thousandth of an inch (0.03 millimeters) above a metal heat pipe spreader, powered by a brushless motor in the middle. The end result is a cooler that is very quiet and 30 times more efficient than a fan-and-heatsink solutions.










