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2.7.9.CPU, Chassis, and Power fan connectors (4-pin CPU_FAN, 3-pin PWR_FAN)
Connect the fan cables to the fan connectors on the motherboard, making sure that the black wire of each cable matches
the ground pin of the connector.
2.7.10.COM header：COM
This COM header is for COM serial devices
2.7.11.SPEAK header:BZ
This SPEAK header is for Speaker serial devices
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