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FAN Power Headers: SYS_FAN1 (3-pin), CPU_FAN (4-pin)
These connectors support cooling fans of 350mA (4.2 Watts) or less, depending
on the fan manufacturer, the wire and plug may be different. The red wire
should be positive, while the black should be ground. Connect the fan's plug to
the board taking into consideration the polarity of connector.