ASRock 4CoreN73PV-HD720p R3.0 Quick Installation Guide - Page 23
Please connect an ATX 12V
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Chassis Fan Connector (3-pin CHA_FAN1) (see p.2 No. 16) CPU Fan Connector (4-pin CPU_FAN1) (see p.2 No. 5) 4 3 2 1 Please connect a chassis fan cable to this connector and match the black wire to the ground pin. 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.2 No. 2) 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 Connector (4-pin ATX12V1) (see p.2 No. 3) 20-Pin ATX Power Supply Installation 1 13 Please connect an ATX 12V power supply to this connector. Serial port Header (9-pin COM1) (see p.2 No. 9) This COM1 header supports a serial port module. English 23 ASRock 4CoreN73PV-HD720p Motherboard