MSI B450M-A PRO MAX II Micro-ATX Motherboard - Manual (Page 32)

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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
24
13 1
12
ATX_PWR1
CPU_PWR1
CPU_PWR1
Pin Signal Name Pin Signal Name
1 Ground 2 Ground
3 +12V 4 +12V
3
2 1
4