You are looking at a selection of PWM Fan Splitters which can be used to connect upto 4 fans to just a single fan connector on a motherboard Fantastic for those wanting a neat build as it allows you to minimise loose wires in the case while giving a clean look with the braided sleeves Compatible with 3 pin fans and also 4 pin fans Please note, that due to 3 pin fans limitations, they cannot be controlled via PWM as they lack the 4th pin for PWM control PWM allows you to control the speed of your fans through BIOS settings on modern motherboards - please check if your motherboard can support this if you wish to do so It is also recommended to check the power draw of the fans, as majority motherboards can handle up to 1.0 A on a single header