Quiet PC PID controller References External links 4-Wire PWM Controlled Fans Specification v1.3, Intel 3-Wire and 4-Wire Fan Connectors, Intel 3-Wire, 4-Wire Motherboard Fan Connector Pinouts, AllPinouts Why and How to Control (2/3/4-wire) Fan Speed for Cooling Electronic Equipment, Analog Devices Controlling fanspeeds in Linux on PWM motherboards, Thinkpads and ASUS Eee PC IBM PC compatibles Computer hardware cooling