Expand 5-bit fan 3-pin/4-pin interface, solve the lack of motherboard interface, and centralized processing of fan wire. The CPU interface is connected to the CPU fan interface of the main board, and the first dedicated interface for the CPU fan. The fan1/fan2/fan3/fan4 interface is a PWM conventional fan interface. Five fans are powered by large 4Pin interface at the same time, which can reduce the load of the main board, increase the service life of the main board, and realize the PWM speed regulation function. There are two interfaces on the top of the cable, one is the big 4Pin power supply interface, which is connected to the D-shaped port of the power supply, the other is the 4Pin speed measurement and temperature control (PWM) function, which is connected to the four pins of the computer motherboard, so that several fans can realize the synchronous temperature control function with the motherboard at the same time.