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Fans with three pin connectors must be used on 3 pin cpu fan pinouts the 3 pin senses fan rpm revolutions per minute when no revolutions are sensed by the system an audio alarm or no system boot will occur warning the user or preventing proccessor overheating and burnout. Fans may be either 5 volt dc or 12 volt dc fans colors may change chassis and cpu fans may use either 3 pin or 4 pin power connectors 3 pin connectors are usually used for the smaller chassis fans with lower power consumption 4 pin connectors are usually used by cpu fans with higher power consumption. Hi folks if i want to wire my 4 pin coolink swif2 120p pwm fan yellow black green blue wires direct to a 12v dc source do i connect the yellow lead to the 12v positive the black to ground and ignore the blue and green signal leads. Pinout of motherboard pwm fan connectorfor 4 wire pulse width modulation pwm controlled fans pinouts devices connectors a fan with a 3 pin power connector may be easilly fitted into desktop board with a 4 pin fan header motherboard 4 pin cpu pwm fan connector visual pinout click to enlarge contributors tolk. How do i wire a 3 wire cpu case fan to a regular plug the fan has 3 wires redblackwhite and is a dc 12v 03a fan i cut the end off and tried connecting it to an ac adaptor class 2 power supply input 120vac 60hz 15w output 12vdc 600ma the plug has 2 wires