Fan Connector
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Fan connector This keyed, 3-pin connector plugs into the motherboard and allows the system level software to control the fan, turning it on or off by overriding the power connector.

The Fan Always On field overrides Advanced Power Management (APM) fan control. The APM fan control turns the fan off any time the computer enters a power-managed state. Set to the Yes option, the fan remains on any time the computer is turned on or in an APM state. If Small Computer System Interface (SCSI) devices are detected in the computer, the fan remains on.