ASRock FM2A75M-DGS Quick Installation Guide - Page 20
Please connect an ATX 12V
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Chassis and Power Fan Connectors (4-pin CHA_FAN1) (see p.2 No. 16) GND +12V CHA_FAN_SPEED FAN_SPEED_CONTROL (3-pin PWR_FAN1) (see p.2 No. 31) +12V GND PWR_FAN_SPEED Please connect the fan cables to the fan connectors and match the black wire to the ground pin. CHA_FAN1 fan speed can be controlled through UEFI or AXTU. CPU Fan Connectors (4-pin CPU_FAN1) (see p.2 No. 4) FAN_SPEED_CONTROL CPU_FAN_SPEED +12V GND 1 2 3 4 Please connect the CPU fan cable to the connector and match the black wire to the ground pin. Though this motherboard provides 4-Pin CPU fan (Quiet Fan) support, the 3-Pin CPU fan still can work successfully even without the fan speed control function. If you plan to connect the 3-Pin CPU fan to the CPU fan connector on this motherboard, please connect it to Pin 1-3. Pin 1-3 Connected 3-Pin Fan Installation ATX Power Connector (24-pin ATXPWR1) (see p.2 No. 6) 12 24 Please connect an ATX power supply to this connector. 1 13 Though this motherboard provides 24-pin ATX power connector, 12 24 it can still work if you adopt a traditional 20-pin ATX power supply. To use the 20-pin ATX power supply, please plug your power supply along with Pin 1 and Pin 13. 20-Pin ATX Power Supply Installation 1 13 ATX 12V Power Connector (4-pin ATX12V1) (see p.2, No. 1) Serial port Header (9-pin COM1) (see p.2 No.24) Please connect an ATX 12V power supply to this connector. This COM1 header supports a serial port module. English 20 ASRock FM2A75M-DGS Motherboard