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Important

Make sure that all the power cables are securely connected to a proper ATX power

supply to ensure stable operation of the motherboard.

ATX_PWR1, CPU_PWR1: Power Connectors

These connectors allow you to connect an ATX power supply.

ATX_PWR1

Pin Signal Name Pin Signal Name

1 +3.3V 2 +3.3V

3 Ground 4 +5V

5 Ground 6 +5V

7 Ground 8 PWR OK

9 5VSB 10 +12V

11 +12V 12 +3.3V

13 +3.3V 14 -12V

15 Ground 16 PS-ON#

17 Ground 18 Ground

19 Ground 20 Res

21 +5V 22 +5V

23 +5V 24 Ground

131

ATX_PWR1

CPU_PWR1

Pin Signal Name Pin Signal Name

1 Ground 2 Ground

3 +12V 4 +12V

2 1

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MSI B450M-A PRO MAX II Specifications

General