ASRock K8A780LM User Manual - Page 25
ATX 12V Power Connector
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ATX Power Connector (24-pin ATXPWR1) (see p.10 No. 7) 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 (4-pin ATX12V1) (see p.10 No. 2) Serial port Header (9-pin COM1) (see p.10 No.32) 20-Pin ATX Power Supply Installation 1 13 RRXD1 DDTR#1 DDSR#1 CCTS#1 1 RRI#1 RRTS#1 GND TTXD1 DDCD#1 Please note that it is necessary to connect a power supply with ATX 12V plug to this connector. Failing to do so will cause power up failure. This COM1 header supports a serial port module. 25