PWM Fan Hub Splitter Controller PWM 1 to 10 Fan Hub Splitter Cable CPU Case Chasis Cooling Fan Splitter Hub Controller 10 Ports For 3pin 4pin CPU Cooler / Case / Chasis Cooling Fans PWM Controller 12V With Molex 4 Pin power supply port, more stable 40cm PWM cable include Please note: 4Pin fan speed can be adjusted by temperature control. 3Pin fan can also be used, but because 3Pin has no PWM function, it is at fixed speed (full speed) after inserting In the hub interfaces, the RED CPU interface is the CPU fan dedicated interface (with speed detection function). Since the mainboard can only receive one rotation speed signal, the remaining nine conventional fan interfaces have the PWM function, but no speed signal(will work at full speed)