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Brand MSI
CPU Socket Socket 7
Compatible Devices Gaming Console, Personal Computer
RAM Memory  DDR4
Compatible Processors AMD 3rd Generation Ryzen

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MSI MPG B550 Gaming Plus


  • Powered by 3rd generation AMD Ryzen 9, Ryzen7, and Ryzen 5 AM4 to maximize connectivity and speed with dual M.2, PCIe 4.0, USB 3.2 Gen2, and up to 128GB of DDR4 (4400MHz).
  • On-board Wi-Fi 6 (802.11ax) with MU-MIMO support which provides a great networking performance and online gaming experience.
  • With 3rd Gen Ryzen processors, this motherboard features the latest Lightning Gen 4 solution on both PCI-E and M.2 slots, which allow for faster data transfer on graphics cards, storage devices, and networking devices.
  • Mystic Light provides a complete function to control the RGB light all around the system. It supports both RGB and RAINBOW LED strips, and 16.8 million colors / 29 effects controlled in one click.
  • AUDIO BOOST rewards your ears with studio-grade sound quality for the most immersive gaming experience.
  • Enhanced Thermal Solution includes an extended heatsink, 7W/mK level thermal & choke pad with 2oz thickened copper PCB to ensure the best performance for gamers.
  • Pre-installed I/O Shielding provides better EMI protection and more convenience for installation.




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
Chipset AMD B550 Chipset
Memory 4x DDR4 memory slots, support up to 128GB

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 4400 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)

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

2x PCIe 3.0 x1 slots

The supported specification depends on the installed processor.

When installing PCIe SSD in M.2_2, the PCI_E3 slot will be unavailable.

Multi-GPU Supports 2-Way AMD CrossFire™ Technology
Onboard Graphics 1x HDMI port supports a maximum resolution of 4096×2160 @24Hz

1x DisplayPort supports a maximum resolution of 4096×2160 @60Hz

Maximum shared memory of 16 GB

Available for the processor with integrated graphics.

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

Supports SATA 6Gb/s

Supports 2242/ 2260/ 2280/ 22110 storage devices

M2_2 slot (from AMD B550 chipset)

Supports PCIe 3.0×4

Supports 2242/ 2260/ 2280 storage devices

The supported specification depends on the 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

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 1 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

Supports S/PDIF output

LAN 1x Realtek® 8111H Gigabit LAN controller
LED Features 1x EZ LED Control switch

4x EZ Debug LED

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 PS/2 Combo Port


LAN Port

USB 3.2 Gen 2 10Gbps (Type-A)

HD Audio Connectors

Flash BIOS Button

USB 2.0


USB 2.0

USB 3.2 Gen 1 5Gbps (Type-A)

USB 3.2 Gen 2 10Gbps (Type-C)

Optical S/PDIF OUT

Dimensions ATX Form Factor

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

Mounting 9 mounting holes
I/O Controller NUVOTON NCT6687-R Controller Chip
Hardware Monitor CPU/ System/ Chipset temperature detection

CPU/ System/ Pump fan speed detection

CPU/ System/ Pump fan speed control

Warranty 3 Years




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