Red-positive pole (power line L), black-negative pole (ground line G) and yellow-speed measurement.

Four-wire heater Four wires are defined as

Red positive pole (power line L), black negative pole (ground line G), yellow speed and blue speed control.

For general CPU fans, there are 2-pin, 3-pin and 4-pin fans.

Two-pin fan: it is relatively rare in the market at present. It can realize simple power supply and support the constant speed operation of the fan, but it has no temperature control effect.

Three-pin fan: There are many fans on the market at present. This radiator can adjust the fan voltage and control the fan speed in real time through the special channel provided in the motherboard to achieve the purpose of temperature control.

Four-legged fan: it contains dynamic adjustment elements, and can realize dynamic temperature control function without changing voltage. Generally speaking, the speed range is between 30% and 99%, and it can almost run at full load without pressurization, which has little effect on the life of its radiator. Now many motherboards have four CPU fan pins, and the leftmost pin of the four pins is specially used to control the fan temperature.

Of course, whether it is a 2-pin, 3-pin or 4-pin fan, its working voltage is generally between 5V DC and 12V.