be quiet! delivers the SilentWings PWM fans
 

ermany's own be quiet has now let loose a new trio of SilentWings case fans, this time, with a built-in PWM function, enabling users to choose the speed they will operate at. The 80, 92 and 120mm fans have a screwless mounting system for easy installation, a Copper-Core FDB (Fluid Dynamic Bearing) for a long life of up to 300,000 hours, and a PWM controller.

http://www.tcmagazine.com/comments.php?id=30663&catid=2