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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

  • CPU Socket TypeAM4
  • CPU TypeSupports AMD Ryzen 5000 & 3000 Series desktop processors (no
  • ChipsetAMD B550
  • Number of Memory Slots2x288pin (DDR4)
  • Memory StandardAMD Ryzen 4000 G-Series processors support DDR4 5300+ (Max.
  • Maximum Memory Supported64GB
  • 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.

Points forts

  • 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

Caractéristiques

BrandMSI
ModelMEG B550 UNIFY-X
CPU Socket TypeAM4
CPU TypeSupports 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
ChipsetAMD B550
Number of Memory Slots2x288pin (DDR4)
Memory StandardAMD Ryzen 4000 G-Series processors support DDR4 5300+ (Max. 5800)/ 5100/ 5000/ 4866/ 4800/ 4733/ 4600/ 4533/ 4400/ 4266/ 4133/ 4000/ 3866/ 3733/ 3600/ 3466/ 3200/ 3066/ 3000/ 2933/ 2800/ 2667 MHz by A-XMP OC MODE
3rd Gen AMD Ryzen processors supports DDR4 5100+/ 5000/ 4866/ 4800/ 4733/ 4600/ 4533/ 4400/ 4266/ 4133/ 4000/ 3866/ 3733/ 3600/ 3466/ 3200/ 3066/ 3000/ 2933/ 2800/ 2667 MHz by A-XMP OC MODE
Supports DDR4 3200/ 3066/ 3000/ 2933/ 2800/ 2667/ 2400/ 2133/ 1866 MHz by JEDEC
AMD Ryzen 4000 G-Series processors:
1DPC 1R max speed 5300 MHz (QVL), Max. 5800 MHz
1DPC 2R max speed 4266
Maximum Memory Supported64GB
Channel SupportedDual Channel
PCI Express 4.0 x161 x PCIe 4.0/3.0 x16 slot (PCI_E1) *
* The supported specification depends on installed processor.
PCI Express 3.0 x161 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.
PCI Express x161 x PCI Express x16
PCI Express x12 x PCIe 3.0 x1 slots (PCI_E2 & PCI_E3)
* The both PCIe x1 slots will be unavailable after you install the M.2 SSD into M2_2 slot in Chipset support mode (default mode).
Serial ATA (SATA)6 x SATA 6Gb/s ports 1 2
1. The SATA5 port will be unavailable when installing M.2 SATA SSD into M2_3.
2. The SATA5 and SATA6 ports will be unavailable when installing M.2 PCIe SSD into M2_3.
M.24 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 RAID0/1/10
Onboard Video ChipsetSupported only by CPU with integrated graphic:
1 x HDMI 2.1 port, supporting a maximum resolution of 4096x2160 @120 Hz 1 2
Maximum shared memory of 16GB
1. Available for the processor with integrated graphics.
2. Graphics specifications may vary depending on the CPU installed.
Audio ChipsetRealtek ALC1220P Codec
Audio Channels7.1-Channel High Definition Audio
Supports S/PDIF output
LAN ChipsetRealtek RTL8125B
Max LAN Speed2.5Gbps
Wireless LANIntel Wi-Fi 6 AX200
The Wireless module is pre-installed in the M.2 (Key-E) slot
Supports MU-MIMO TX/RX, 2.4GHz/5GHz (160MHz) up to 2.4Gbps
Supports 802.11 a/ b/ g/ n/ ac/ ax
BluetoothSupports Bluetooth 5.1
USB 3.04 x USB 3.0
Onboard USB1 x USB 3.2 Gen 2 10Gbps Type-C port
1 x USB 3.2 Gen 1 5Gbps connector (supports additional 2 USB 3.2 Gen 1 5Gbps ports)
2 x USB 2.0 connectors (supports additional 4 USB 2.0 ports)
Other Connectors1 x 4-pin CPU fan connector
1 x 4-pin water-pump fan connector
6 x 4-pin system fan connectors
1 x Front panel audio connector
2 x System panel connectors
1 x Chassis Intrusion connector
1 x 4-pin RGB LED connectors
2 x 3-pin RAINBOW LED connectors
1 x 3-pin CORSAIR LED connector
1 x TPM module connector
1 x Clear CMOS jumper
1 x Power button
1 x Reset button
Form FactorATX
LED LightingRGB
Dimensions (W x L)12.0" x 9.6"
Power Pin1 x 24-pin ATX main power connector
2 x 8-pin ATX 12V power connector
1 x 6-pin PCIE power connector
Windows 11Supported
FeaturesSupports 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.
Supports DDR4 Memory, Dual Channel 5300(OC) MHz+ (MAX5800).
Quadruple M.2 Connectors: Maximum onboard 4 x M.2 slots, support the latest Gen 4 solution with up to 64GB/s bandwidth for maximum transfer speed.
Extreme Power Design: Direct 14+2 phases with 90A Power Stage and dual CPU power connectors to unleash your true power.
Premium Thermal Solution: Aluminum Cover with additional choke thermal pad rated for 7W/mk and PCB wit

Questions sur cet article

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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