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Overview of Components

131

ATX_PWR1

1 +3.3V 13 +3.3V

2 +3.3V 14 -12V

3 Ground 15 Ground

4 +5V 16 PS-ON#

5 Ground 17 Ground

6 +5V 18 Ground

7 Ground 19 Ground

8 PWR OK 20 Res

9 5VSB 21 +5V

10 +12V 22 +5V

11 +12V 23 +5V

12 +3.3V 24 Ground

4 1

CPU_PWR1

1 Ground 5 +12V

2 Ground 6 +12V

3 Ground 7 +12V

4 Ground 8 +12V

⚠

Important

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

supply to ensure stable operation of the motherboard.

CPU_PWR1, ATX_PWR1: Power Connectors

These connectors allow you to connect an ATX power supply.

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MSI MAG B550M MORTAR WIFI Specifications

General

Form Factor	Micro ATX
Chipset	AMD B550
Socket	AM4
Memory Slots	4 x DIMM
Max Memory	128 GB
Audio	Realtek ALC1200 Codec
RGB Support	Mystic Light RGB
Memory Speed	Up to 4400 MHz (OC)
Storage Interface	6 x SATA 6Gb/s
USB Ports	1 x USB 3.2 Gen 2 Type-C, 1 x USB 3.2 Gen 2 Type-A, 2 x USB 2.0
Networking	Realtek RTL8125B 2.5G LAN
LAN	2.5Gbps
Wi-Fi	Wi-Fi 6 AX200
PCIe Slots	1 x PCIe 4.0 x16, 1 x PCIe 3.0 x16 (x4 mode), 1 x PCIe 3.0 x1