ASRock Z77 Pro3 Quick Installation Guide - Page 33
Please connect an ATX 12V
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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 8 5 (8-pin ATX12V1) (see p.2, No. 4) 4 1 Please connect an ATX 12V power supply to this connector. Though this motherboard provides 8-pin ATX 12V power connector, it can still work if you adopt a traditional 4-pin ATX 12V power supply. To use the 4-pin ATX power supply, please plug your power supply along with Pin 1 and Pin 5. 8 5 Serial port Header (9-pin COM1) (see p.2, No. 28) 4-Pin ATX 12V Power Supply Installation 4 1 This COM1 header supports a serial port module. HDMI_SPDIF Header (2-pin HDMI_SPDIF1) (see p.2, No. 29) 1 GND SPDIFOUT HDMI_SPDIF header, providing SPDIF audio output to HDMI VGA card, allows the system to connect HDMI Digital TV/ projector/LCD devices. Please connect the HDMI_SPDIF connector of HDMI VGA card to this header. English 33 ASRock Z77 Pro3 Motherboard