ASRock H55 Pro User Manual - Page 30
Please connect an ATX 12V
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Chassis and Power Fan Connectors (4-pin CHA_FAN1) (see p.12 No. 7) GND +12V CHA_FAN_SPEED FAN_SPEED_CONTROL Please connect the fan cables to the fan connectors and match the black wire to the ground pin. (3-pin CHA_FAN2) (see p.12 No. 8) GND +12V CHA_FAN_SPEED (3-pin CHA_FAN3) (see p.12 No. 12) GND +12V CHA_FAN_SPEED (3-pin PWR_FAN1) (see p.12 No. 40) PWR_FAN_SPEED +12V GND CPU Fan Connector (4-pin CPU_FAN1) (see p.12 No. 39) FAN_SPEED_CONTROL 4 CPU_FAN_SPEED 3 +12V 2 GND 1 Please connect a CPU fan cable to this 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.12, 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. ATX 12V Power Connector 8 (8-pin ATX12V1) 4 (see p.12 No. 2) 20-Pin ATX Power Supply Installation 1 13 Please connect an ATX 12V 5 power supply to this connector. 1 30