Pin 4 = PWM control signal, approx 22 KHz freq, Pulse Width Modulation signal, 5 VDC peak) Pin 3 = Speed signal (5 VDC pulses, 2 per revolution) generated by the motor and sent to header on this pin Recall, Pins 1-3 are between the ridges, Pin 4 is outside. NOTE that this is for the newer-design PWM style of motor, and NOT what an older 3-pin simpler motor (speed controlled by varying Voltage supplied) does. IF you can figure out what the old system pins do, here is how the current "standard" 4-pin fan connector is wired.
HOWEVER, the fact that the old fan and mobo use a connector DIFFERENT from what has become "standard" means it is also possible that the PINOUT they use does NOT match what is the standard today. 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. There MIGHT be more to this than you think.
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