MSI B550-A PRO

CPU

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



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



Expansion Slot

1x PCIe 4.0/ 3.0 x16 slot (PCI_E1) 1

1x PCIe 3.0 x16 slot (PCI_E3), supports x4 speed

2x PCIe 3.0 x1 slots

The supported specification depends on installed processor.

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 port, supports a maximum resolution of 4096x2160 @24Hz

1x DisplayPort, supports a maximum resolution of 4096x2160 @60Hz

Maximum shared memory of 2048 MB

Available for the processor with integrated graphics.



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



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

3x USB 3.2 Gen 1 5Gbps ports (1 Type-C internal connector, and 2 ports are available through the internal USB 3.2 Gen 5Gbps connector)

8x USB 2.0 ports (4 Type-A ports on the back panel, 4 ports through the internal USB 2.0 connectors)

AMD Processor

2x USB 3.2 Gen 2 10Gbps ports (1 Type-C port and 1 Type-A port on the back panel)

2x USB 3.2 Gen 1 5Gbps Type-A ports on the back panel



Audio

Realtek® ALC892 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

Keyboard / Mouse

DisplayPort

LAN

HD Audio Connectors

Flash BIOS Button

USB 2.0

HDMI

USB 2.0

USB 3.2 Gen 1 5Gbps Type-A

USB 3.2 Gen 2 10Gbps Type-A+C



Dimensions

ATX Form Factor

12 in. x 9.6 in. (30.5 cm x 24.4 cm)