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Rectangular black ATX motherboard with silver heatsinks and two DDR4 slots

MSI

MSI MEG B550 UNIFY-X AMD motherboard

SKU CH-549R-K7YQV

ATX board for AMD Ryzen 5000 and 3000 series CPUs, dual-channel DDR4 up to 64 GB, one PCIe 4.0 x16 slot, four M.2 slots, six SATA 6Gb/s ports, Realtek 8125B LAN and Realtek ALC1220P 7.1 audio

  • ProcessorSupports AMD Ryzen 5000 & 3000 Series desktop processors (no
  • ChipsetAMD B550
  • Form factorATX
  • CPU socketAM4
  • Memory slot count2 × 288pin (DDR4)
  • Supported memoryAMD Ryzen 4000 G-Series processors support DDR4 5300+ (Max.
  • Supports Ryzen 5000 and 3000 series CPUs on AM4 socket
  • Four M.2 slots including one PCIe 4.0 x4 from CPU
  • DDR4 memory overclocking up to 5800 MHz with Ryzen 4000 G-Series
  • Realtek ALC1220P codec delivers 7.1-channel high-definition audio
  • HDMI 2.1 port outputs 4096x2160 at 120 Hz with integrated graphics

AM4 Ryzen 5000 and 3000 platform

The MSI MEG B550 UNIFY-X is an ATX motherboard built on the AMD B550 chipset for socket AM4. It accepts AMD Ryzen 5000 and 3000 series desktop processors plus Ryzen 4000 G-Series chips. The board omits support for Ryzen 5 3400G and Ryzen 3 3200G. It targets builders who want a focused two-slot memory layout and extensive M.2 capacity.

Ideal for high-frequency dual-channel memory

Enthusiasts chasing maximum DDR4 frequency on a dual-channel platform will benefit from the two 288-pin slots and validated speeds up to 5800 MHz with Ryzen 4000 G-Series. Users needing four memory modules or more than 64 GB total capacity should choose a four-slot board instead.

Four M.2 slots with CPU-direct PCIe 4.0

The board provides four Key M M.2 sockets. The primary M2_1 slot connects to the CPU and supports PCIe 4.0 x4 and SATA 6Gb/s for 2280 or 22110 devices. The remaining three slots route through the chipset with varying lane allocations and share bandwidth with PCIe x1 slots and SATA ports.

How it compares

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

Price $138.99
Cheaper than about 65% of the 1,906 comparable items (median $224.49).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameMSI
Model nameMEG B550 UNIFY-X
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 socketAM4
ChipsetAMD B550
Memory
Memory slot count2 × 288pin (DDR4)
Max supported RAM64 GB
Memory channelsDual Channel
Storage
M.2 slots4 x M.2 slots (Key M)
M2_1 slot (from CPU):
Supports PCIe 4.0/3.0 x4*
Supports SATA 6Gb/s
Supports 2280/22110 storage devices
M2_2 slot:
Chipset support mode (default, from Chipset ) - supports PCIe 3.0 x2
CPU support mode (From CPU) - supports PCIe 4.0/3.0 x4 *
Supports 2280 storage devices
M2_3 slot:
Chipset support mode (default, from Chipset ) - supports PCIe 3.0 x2
CPU support mode (From CPU) - supports PCIe 4.0/3.0 x4 *
Supports SATA 6Gb/s
Supports 2280/22110 storage devices
M2_4 slot:
Supports PCIe 3.0 x4
Supports 2280 storage devices
* M.2 specifications may vary depending on
SATA and RAID support0/1/10
Audio & video
Audio chipRealtek ALC1220P Codec
Sound channels7.1-Channel High Definition Audio
Supports S/PDIF output
Connectivity
Ethernet controllerRealtek RTL8125B
Maximum network speed2.5 Gbit/s
Wi-Fi standardIntel Wi-Fi 6 AX200
The Wireless module is pre-installed in the M.2 (Key-E) slot
Supports MU-MIMO TX/RX, 2.4 GHz/5 GHz (160 MHz) up to 2.4 Gbit/s
Supports 802.11 a/ b/ g/ n/ ac/ ax
Bluetooth supportSupports Bluetooth 5.1
Ports & slots
PCIe 4.0 x16 slots1 x PCIe 4.0/3.0 x16 slot (PCI_E1) *
* The supported specification depends on installed processor.
PCIe 3.0 x16 slots1 x PCIe 3.0 x16 slot (PCI_E4), supports x4 speed
* The PCI_E4 slot will be unavailable, when installing M.2 SSD into M2_4.
PCIe x16 slots1 x PCI Express x16
USB 3.0 ports4 x USB 3.0
Onboard USB headers1 x USB 3.2 Gen 2 10 Gbit/s Type-C port
1 x USB 3.2 Gen 1 5 Gbit/s connector (supports additional 2 USB 3.2 Gen 1 5 Gbit/s ports)
2 x USB 2.0 connectors (supports additional 4 USB 2.0 ports)
Power
Power connectors1 × 24-pin ATX main power connector
2 × 8-pin ATX 12 V power connector
1 × 6-pin PCIE power connector
Size & build
Form factorATX
Width and length12.0 in × 9.6 in
Compatibility
Windows 11 supportSupported
More details
LightingRGB

Questions about this item

How loud does the VRM area run under sustained load?

The board uses a fanless VRM heatsink with a large surface area, so it produces no mechanical noise; thermal load is handled by case airflow.

Which components must already be in the system for the MEG B550 UNIFY-X to post?

An AM4 Ryzen 5000, 4000 G-Series or 3000 Series CPU (except 3400G and 3200G), two DDR4 DIMMs up to 64 GB total, and an ATX power supply with 24-pin and 8-pin EPS connectors.

Will my existing PCIe 3.0 x4 SSD work in the M2_2 slot without disabling other devices?

In the default chipset mode M2_2 runs at PCIe 3.0 x2; the two PCIe x1 slots become unavailable when M2_2 is populated.

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