MSI AM4 Micro-ATX B550M-A PRO DDR4 Motherboard

CPU

Supports AMD Ryzen™ 5000 & 3000 Series desktop processors (not compatible with AMD Ryzen™ 5 3400G & Ryzen™ 3 3200G) and AMD Ryzen™ 4000 G-Series desktop processors

See supported processors

Chipset

AMD B550 Chipset

Memory

• 2x DDR4 memory slots, support up to 64GB ¹
  • Supports DDR4 1866/ 2133/ 2400/ 2667/ 2800/ 2933/ 3000/ 3066/ 3200 MHz by JEDEC
  • Supports DDR4 2667/ 2800 /2933 /3000 /3066 /3200 /3466 /3600/ 3733 /3866 /4000 /4133 /4266 /4400/ 4600+ MHz by A-XMP OC MODE
    • 1DPC 1R max speed 4600 MHz
    • 1DPC 2R max speed 3866 MHz
• Dual channel memory architecture
• Supports non-ECC UDIMM memory
• Supports ECC UDIMM memory (non-ECC mode)
• Supports un-buffered memory

1. Please refer www.msi.com for more information on compatible memory.

See supported memory

Expansion Slot

• 1x PCIe 3.0 x1 slot ¹
• 1x PCIe 4.0/3.0 x16 slot

1. The supported specification depends on installed processor.

Onboard Graphics

• 1x HDMI™ 2.1 port, supports a maximum resolution of 4096x2160 @60Hz¹²
  Support HDCP 1.4 & 2.3
• 1x DVI-D port, supports a maximum resolution of 1920x1200@60Hz¹
• Maximum shared memory of 16 GB

1. Available for the processor with integrated graphics.
2. Graphics specifications may vary depending on the CPU installed.

Storage

AMD B550 Chipset

• 4x SATA 6Gb/s ports
• 1x M.2 slot (Key M) (from AMD Processor)
  • Supports PCIe 4.0/ 3.0 ¹
  • Supports SATA 6Gb/s
  • Supports 2242/ 2260/ 2280 storage devices

1. The supported specification depends on installed processor.

RAID

• Supports RAID 0, RAID 1 and RAID 10 for SATA storage devices
• Supports RAID 0 and RAID 1 for M.2 NVMe storage devices

USB

AMD B550 Chipset

• 2x USB 3.2 Gen 1 5Gbps ports are available through the internal USB 3.2 Gen 1 5Gbps connector
• 6x USB 2.0 ports (2 Type-A ports on the back panel, 4 ports through the internal USB 2.0 connectors)

AMD Processor

• 4x USB 3.2 Gen 1 5Gbps Type-A ports on the back panel

Audio

Realtek^® ALC892/ALC897 Codec

• 7.1-Channel High Definition Audio

LAN

• 1x Realtek^® RTL8111H Gigabit LAN controller

Internal connectors

• 1x 24-pin ATX main power connector
• 1x 4-pin ATX 12V power connector
• 4x SATA 6Gb/s connectors
• 1x M.2 slots (M-Key)
• 1x USB 3.2 Gen 1 5Gbps connector (supports additional 2 USB 3.2 Gen 1 5Gbps ports)
• 2x USB 2.0 connectors (supports additional 4 USB 2.0 ports)
• 1x 4-pin CPU fan connector
• 1x 4-pin system fan connectors
• 1x Front panel audio connector
• 2x System panel connectors
• 1x Chassis Intrusion connector
• 1xTPM module connector
• 1x Clear CMOS jumper

Back panel ports

1. LAN port
2. HDMI™
3. DVI-D
4. Keyboard / Mouse
5. USB 3.2 Gen 1 5Gbps Type-A
6. USB 3.2 Gen 1 5Gbps Type-A
7. USB 2.0 Ports
8. Audio Connectors

Dimensions

• Micro-ATX Form Factor
• 9.3 in. x 7.9 in. (23.6 cm x 20 cm)

MOUNTING

8 mounting holes

Box content

1. MSI^® does not guarantee the risks or damages caused by changing the cover.
2. These pictures are for reference only and may vary without notice.