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  1. sanoayykk

    MacPro Fan PinOut

    Try this. The pin 4 that you thought of as pwm is actually the Vcc. That's why fan speed shifts as the changing of analog voltage of pin4. On the other hand, pin 2 is the true pwm input. However it is not pulled up like ordinary fans so you have to add resistor manually in order to make the pwm...
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