ASROCK PRO Series User Manual page 45

ATX 12V Power Connectors
(8-pin ATX12V1) (see p.7, No. 1)
(8-pin ATX12V2) (see p.7, No. 2)
This motherboard provides two 8-pin ATX 12V power connectors. To use a 4-pin
ATX power supply, please plug it along Pin 1 and Pin 5.
*Connecting an ATX 12V 8-pin cable to ATX12V2 is optional.
*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.
B860 Pro-A WiFi
B860 Pro-A
ATX12V2
8 5
1
4
ATX12V1
8 5
1
4
41