?Function?- Solve the problem of 3Pin or 4Pin interface is not enough, change the different interface can adjust the fan speed. ?12V Cable?- Two 12V power, 12V fan that is normal full speed operation (12V for the yellow and black wire). ?7V Cable?- One 7V power supply, 12V fan using 7V can reduce the speed and wind noise! (5V is red and yellow wire). ?5V Cable?- One 5V take power, 12V fan using 5V can reduce the speed, reduce wind noise! (5V is red and black wire). ?Note?- Individual power supplies do not support 7V, you need to unplug the 7V cable and restart the computer.