B550-A PRO

CPU

Supports AM4 socket 3rd Gen AMD Ryzen^™ processors, and future AMD Ryzen^™ processors with BIOS update.

See supported processors

Chipset

AMD B550 Chipset

Memory

• 4x DDR4 memory slots, support up to 128GB 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+ MHz by A-XMP OC MODE
    • 1DPC 1R Max speed 4800 MHz
    • 1DPC 2R max speed 3866 MHZ
    • 2DPC 1R max speed 4000 MHZ
    • 2DPC 2R max speed 3600 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.

Expansion Slot

• 1x PCIe 4.0/ 3.0 x16 slot (PCI_E1) ¹
• 1x PCIe 3.0 x16 slot (PCI_E3), supports x4 speed ²
• 2x PCIe 3.0 x1 slots

1. The supported specification depends on installed processor.
2. When installing PCIe SSD in M.2_2, PCI_E3 slot will be unavailable.

Multi-GPU

• Supports 2-Way AMD CrossFire^™ Technology

Onboard Graphics

• 1x HDMI 2.1 port, supports a maximum resolution of 4096x2160 @60Hz ¹²
• 1x DisplayPort, supports a maximum resolution of 4096x2160 @60Hz ¹
• Maximum shared memory of 2048 MB

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

Storage

AMD B550 Chipset

• 6x SATA 6Gb/s ports
• 2x M.2 slots (Key M)
  • M2_1 slot (from AMD Processor)
    • Supports PCIe 4.0/ 3.0 x4 ¹
    • Supports SATA 6Gb/s
    • Supports 2242/ 2260/ 2280/ 22110 storage devices
  • M2_2 slot (from AMD B550 chipset)
    • Supports PCIe 3.0x4
    • 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

Audio

Realtek^® ALC892/ALC897 Codec

• 7.1-Channel High Definition Audio

LAN

• 1x Realtek^® 8111H Gigabit LAN controller

Internal connectors

• 1x 24-pin ATX main power connector
• 1x 8-pin ATX 12V power connector
• 6x SATA 6Gb/s connectors
• 2x M.2 slots (M-Key)
• 1x USB 3.2 Gen 1 5Gbps Type-C port
• 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 water-pump fan connector
• 6x 4-pin system fan connectors
• 1x Front panel audio connector
• 2x System panel connectors
• 1x Chassis Intrusion connector
• 1x 4-pin RGB LED connector
• 2x 3-pin RAINBOW LED connectors
• 1xTPM module connector
• 1x Clear CMOS jumper

Back panel ports

Dimensions

• ATX Form Factor
• 12 in. x 9.6 in. (30.5 cm x 24.4 cm)

MOUNTING

9 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.