This pwm hub allows you to connect up to 4 pwm fans by a single pwm fan header on the motherboard the pwm hub is easily attached to a pci panel of the chassis using the supplied cable the pwm hub is connected to the motherboard and the pwm fan can be connected to the fan pwm hub a low profile pci aperture is included in the delivery technical details colour black compatibility 1x pci aperture low profile beiligend connectors 1x 4 pin pwm motherboard to 1x 3 pin 4x 4 pin pwm contents pwm hu