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If you need to install a 3 wire computer fan forget the wiring diagram most computer motherboards come with a standard connector for the fan and it only fits one way if the connector fits the pins itll work and you dont have to worry about the pin arrangement. Fans and on board fan headers are backwards compatible proper fan connector placement is shown in the figures below fan has a 3 pin power connector desktop board has a 4 pin fan header note when using a 3 pin power connector with a 4 pin fan header the fan will always be on there is no fan control. The 4 wire connector has smaller back key to accept the smaller 3 wire fan connector keys the fan will always run at full speed as the control pin will not be used but the rpm feedback tacho of the fan will operate normally and the motherboard will read the rpm normally can i connect a 4 wire fan to a 3 wire connector. Three wire and four wire cpu fans whats the difference ask question three wire and four wire fan connectors chassis and processor fans use either a three wire or four wire connector the three wire connectors are for small chassis fans with lower power consumption pin 3 three wire fan support fan tach pin n a. Of course all you need is the red and black wire to run your computer fan but if you didnt know what the extra wires are for this video may help you out this demonstration shows the effects of