Where is the governor of the chassis fan power cable?

Chassis fan speed control cable connected to the fan 3PIN pins.
A plurality of fans are connected to the chassis fan speed line FAN1, FAN2, FAN3, respectively, can achieve speed.

    Chassis mainly used to enhance the fan inside the chassis and the chassis outside air convection to improve the temperature of the air inside the chassis, thereby reducing the temperature inside the chassis, reinforced chassis processors, graphics cards, motherboards and other thermal performance and extend service life of components. Since most do not have the chassis fan speed control capability, so connect the chassis fan to the chassis fan speed controller, the speed of the fan can not be speed controlled by electronic components, in order to ensure the chassis air convection in the premise, as much as possible to reduce the growth of these fans sporadic noise (fan noise at low speed work will be much lower).