ASROCK A620M-HDV/M.2 User Manual page 44

ATX 12V Power Connector
(8-pin ATX12V1) (see p.5, No. 1)
is motherboard provides a 8-pin ATX 12V power connector. To use a 4-pin
ATX power supply, please plug it along Pin 1 and Pin 5.
*Warning: Please make sure that the power cable connected is for the CPU and
not the graphics card. Do not plug the PCIe power cable to this
connector.
40
ATX12V1
8 5
4
1