DeepCool Fan Hub Control 4PWM Fan Speed Supports Fan 3Pin/4Pin: FH-04 enables users to greatly expand cooling capability within the chassis and enjoy enhanced system performance. FH-04 is able to extend up to 4 fans and compatible with 3-pin/4-pin Fans.PWM Function DesignEach port has its own PWM function and the fan speed can be adjusted at the same time, but o