Asus P3-PH4C User Manual - Page 47
Digital Audio connector 4-1 pin SPDIF_OUT
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4. CPU and Chassis fan connectors (4-pin CPU_FAN, 3-pin CHA_FAN) The fan connectors support cooling fans of a total of 1A~2.2A (26.4W max.) at +12V. 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. Do not forget to connect the fan cables to the fan connectors. Insufficient air flow inside the system may damage the motherboard components. These are not jumpers! DO NOT place jumper caps on the fan connectors. CPU_FAN CPU FAN PWM CPU FAN IN CPU FAN PWR GND Rotation +12V GND CHA_FAN R Fan Connectors 5. Digital Audio connector (4-1 pin SPDIF_OUT) This connector is for the S/PDIF audio module to allow digital sound output. Connect one end of the S/PDIF audio cable to this connector and the other end to the S/PDIF module. R +5V SPDIFOUT GND Digital Audio Connector SPDIF_OUT The S/PDIF out module is purchased separately. 4- Chapter 4: Motherboard info