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Rectangular ATX motherboard in matte black with silver heatsinks and a full I/O shield

MSI

MSI MEG B550 UNIFY AMD motherboard

SKU CH-8DW4-8DSM6

ATX board for Socket AM4 Ryzen 5000, 3000 and 4000 G-Series CPUs with B550 chipset, dual-channel DDR4 up to 5300 MHz, 128 GB capacity, 2.5 Gbps LAN, 7.1 audio and 10 Gbps USB 3.2 Gen 2 ports

  • ProcessorSupports AMD Ryzen™ 5000 & 3000 Series desktop processors (n
  • ChipsetAMD B550
  • CPU socketSocket AM4
  • Supported memorySupports dual-channel DDR4 1866-5300 MHz memory
  • Max supported RAM128 GB
  • PCI slotsAMD Processor 1x PCIe 4.0/ 3.0 x16 slot (PCI_E1) AMD B550 Ch
  • Supports AMD Ryzen 5000 and 3000 series processors via Socket AM4
  • Dual-channel DDR4 memory up to 5300 MHz with 128 GB maximum capacity
  • Primary PCIe 4.0 x16 slot for graphics cards plus secondary PCIe 3.0 x16 slot at x4 speed
  • Realtek ALC1220P codec delivers 7.1-channel high-definition audio with S/PDIF output
  • Realtek RTL8125B controller provides 2.5 Gbps LAN connectivity

Socket AM4 platform

The MSI MEG B550 UNIFY motherboard uses the AMD B550 chipset and a Socket AM4 interface. It supports AMD Ryzen 5000, 4000 G-Series and 3000 series desktop processors, excluding the Ryzen 5 3400G and Ryzen 3 3200G models. The board targets builders who want a full-size ATX foundation for high-end CPUs without moving to a newer socket generation.

128GB DDR4 headroom

Four memory slots accept dual-channel DDR4 kits rated from 1866 to 5300MHz, with a maximum capacity of 128GB. The primary PCIe 4.0 x16 slot connects directly to the processor for current graphics cards, while the chipset supplies a second x16 slot running at x4 speed plus two x1 slots. Six SATA III ports and four M.2 interfaces provide plenty of storage lanes, though the chipset link limits total throughput when every slot is saturated.

ATX layout and rear I/O

The ATX form factor requires a compatible case and a standard 24-pin plus 8-pin CPU power connection. Rear I/O includes four USB 3.2 Gen 2 10Gbps ports, three Type-A and one Type-C, driven by the processor. An internal USB 3.2 Gen 2 Type-C header and additional 5Gbps headers come from the chipset. A Realtek RTL8125B controller delivers 2.5Gbps wired networking, while the Realtek ALC1220P codec handles 7.1-channel audio with S/PDIF output.

How it compares

Measured against everything we stock in Motherboards for AMD CPUs, at today’s prices. Recalculated every night.

Price $185.99
Cheaper than about 56% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameMSI
Product lineMSI MEG B550 UNIFY
Model nameMSI MEG B550 UNIFY
Processor
ProcessorSupports 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
CPU socketSocket AM4
ChipsetAMD B550
Memory
Supported memorySupports dual-channel DDR4 1866-5300 MHz memory
Max supported RAM128 GB
Storage
SATA and RAID support6XSATA III interface, 4xM.2 interface
Audio & video
Audio chipRealtek ALC1220P Codec
7.1-Channel High Definition Audio
Supports S/PDIF output
Connectivity
Ethernet controller1x Realtek RTL8125B 2.5 Gbit/s LAN controller
Ports & slots
PCI slotsAMD Processor
1x PCIe 4.0/ 3.0 x16 slot (PCI_E1)
AMD B550 Chipset
1x PCIe 3.0 x16 slot (PCI_E4), supports x4 speed
2x PCIe 3.0 x1 slots (PCI_E2 & PCI_E3)

Questions about this item

Will my existing DDR4-3200 kit run at its rated speed on the MEG B550 UNIFY?

The board supports dual-channel DDR4 from 1866 MHz up to 5300 MHz, so a 3200 MHz kit will operate at its rated frequency without issue.

How can I confirm the 2.5 Gbps LAN is active after building the system?

Open Windows Device Manager or your OS network settings; the Realtek RTL8125B adapter should show a link speed of 2.5 Gbps when connected to a compatible switch or router.

What cables and accessories come with the MEG B550 UNIFY and what must I source myself?

The box includes the motherboard, a CMOS battery, one SATA cable and the rear I/O shield; CPU cooler mounting hardware, additional SATA cables, M.2 screws and any Wi-Fi antenna are not supplied.

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