It is monitored and displayed by the mobo BIOS, and most systems allow you to specify that this should NOT be done (Ignore the fan speed) if you don't have it available.Ī 4-pin fan output works differently. Measured speed is the signal on the third lead from the end. It does NOT use measured fan speed for control. It is a feedback control loop based on a temperature sensor built into the mobo. NOTE +12 VDC on one end, Ground next to it BUT get the right end - other end is +5 VDCĪ 3-pin fan output on a mobo that actually provides fan speed control varies the +VDC voltage to achieve control. NOTE that Ground is on one end, and +12 VDC next to itĪnd the 4-pin Molex power connector from the PSU: If you can't find them ready-made, you need the pinout details for 4-pin mobo fan connectors here:
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