![]() ![]() Is that right? Of course, that also ensures that you can only connect one way. And that sleeve has some slots in one side that match "tabs" or ridges on the outside of the old fan's connector. Instead it MAY have a sort of "socket" of plastic with the pins inside that sleeve. This leads me to suspect that the header on your old mobo does NOT have that same male fitting with the tongue. ![]() ![]() Now, you refer to those ridges as "tabs". On the mobo MALE header, there is a plastic "tongue" sticking up beside Pins 1 to 3, and those two ridges fit on the outsides of that tongue. IF it's a 4-pin connector, Pin 4 is outside the range of the ridges. ![]() On all current computer fans the female connector on the end of the wires has two ridges running down one side. Want to read more answers from other tech-savvy Stack Exchange users? Check out the full discussion thread here.There MIGHT be more to this than you think. 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: The three wire connectors are for small chassis fans with lower power consumption. 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. SuperUser contributor Homey_D_Clown_IT has the answer for us:Ī three pin connector is basically power (5/12 volt), ground, and signal. ![]()
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