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CPU and System Fan Power Connector (CN1 & CN24)
One 3-pin plug in and error free onboard connectors are located
accessibly for trouble-free connection and disconnection. For CPU
fan it is labeled CN1 for system fan. Pin definitions are listed below:
CPU Fan Power Connector (CN1)
Pin Signal
1 GND
2 +12V
3 Fan Speed Sensor
Fan Power Connector (CN24)
Pin Signal
1 GND
2 +12V
3NC