Want to read more answers from other tech-savvy Stack Exchange users? Check out the full discussion thread here. Have something to add to the explanation? Sound off in the comments. Source: Three Wire and Four Wire Fan Connectors Note: When connecting a three wire fan to a four pin fan header, the fan is always on there is no fan control.Ī four wire fan connecting to a four pin fan header:Ī four wire fan connecting to a three pin fan header: The four wire connectors are for processor fans with higher power consumption.Ī three wire fan connecting to a four pin fan header: Control up to nine 3-pin DC or 4-pin PWM fans, allowing Zero RPM mode to optimize noise levels. The three wire connectors are for small chassis fans with lower power consumption. The RGB & Fan Controller combines optimal fan control, RGB lighting customization, and convenient installationall in an intuitive and easy-to-use package. With this type, fan speed is typically controlled by increasing or decreasing the voltage over the power wire.Ī four pin connector is a little different than the three pin connector since it has the extra (fourth) wire used for controlling and sending signals to the fan, which likely has a chip on it that tells it to slow down or speed up (in addition to the other wires the three pin connector has).Ĭhassis and processor fans use either a three wire or four wire connector. The signal wire measures how fast the fan is moving without any controls for the fan’s speed. Many laptops fan came with only 3 pinout,but as long they can share same ground between the data and vcc,3 or 4 pin seems like work like the same.SuperUser contributor Homey_D_Clown_IT has the answer for us:Ī three pin connector is basically power (5/12 volt), ground, and signal. The second one,since theres one pinout left,there seems possibility of VCC,Data+,Data-,GND pinout.īut as long the motherboard gain temperature data from sync/data pinout from the fan itself,it should be fine,thats why you can turn the laptop into fanless by bypassing the data/sync (cut the fan main power cable) without the VCC for fan itself. The first one,since i see the pics showing the first pinout on the fan doesnt soldered,the 2nd pinout was the VCC (5V) and the 3rd was data/sync (temp,etc) and the 4th are the GND,the 3rd seems the Data/sync and that shows 1V+,but i think it do share the data/sync ground pinout with gnd pinout like the common laptop fan pinout
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