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AAB Cooling C9 - is a cable that allows to connecs the 3Pin fan directly to the 4 Pin-MOLEX connector. The adapter has been additionally equipped with a 3Pin female connector with an output for fan speed reading only. Connect the 3 Pin plug to a 3 Pin connector on the motherboard or an external controller capable of reading the rotation (the plug may include an additional "black -" ground cable, doesn’t affect the rotation reading).
12 V DC
yellow - rotation reading,
black - GND
1 x 4-Pin MOLEX - Male,