![]() ![]() ![]() (At voltage less than 5 VDC, the fan may stall and not re-start until the voltage is increased.) This method is called "Voltage Control Mode" or sometimes "DC Mode". To control fan speed, the mobo header must alter the voltage on Pin #2, ranging form +12 VDC (max) to about +5 VDC. The speed of BOTH 3-pin and 4-pin fans can be controlled, but the method is different for the two types.įor 3-pin fans, the connections to it are Ground to Pin #1, +VDC (varying) to Pin #2, and Speed signal on Pin #3. Actually, you MISunderstand that 4-pin fans only can be controlled.
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