Zalman new PWM Mate is a fan controller with a difference. It modulates the PWM (Pulse Width Modulation) fan speed control signal making it possible to defined the PWM fan speed settings. It works in two ways, automatic mode or manual mode, each provide a flexible customisation of fan speed control according to the cooling needed. The video below shows the how the PWM Mate controls the fan speedhttp://www.youtube.com/v/nnA1CMMvWLI|425|350||