While this feature has become quite popular in the PC cooling solutions industry, with PWM supported fan headers (usually of the 4-pin variety) natively available on most motherboards, there is often only one or two of such headers, reserved for the CPU and/or chipset coolers. This means there's no way this excellent noise reduction idea can be extended to the numerous system fans inhabiting the typical chassis. This is exactly why Cooler Master has come up with its new PWM fan hub, the Wind Rider.



Link: HardwareZone