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THE ACTUAL PRODUCT
MSI MPG B550 GAMING PLUS motherboard, top view of the exact global model; CPU and memory are not installed
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MSI MPG B550 GAMING PLUS

AM4 · ATX · DDR4 · board-only configuration · MSI global specification

ATX motherboard for supported AM4 processors, with 4 DDR4 slots and 2 onboard M.2 storage positions. Realtek RTL8111H 1 Gb Ethernet.

Reviewed 7 Sept 2026Manufacturer specifications, not a hands-on test.
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WHAT IT BRINGS

The useful part.

Provides six SATA connections and separate CPU/chipset M.2 storage positions.

Manufacturer source
BEFORE YOU CHOOSE

The checks that matter.

Installing a PCIe drive in the second M.2 slot disables PCI_E3; plan storage and expansion cards together.

Manufacturer source
NOTHING HIDDEN IN THE SMALL PRINT

Every specification.
With its source.

Our publishing standard
CPU socket
AM4
Conditions & context

Manufacturer specification · Match the exact CPU and required BIOS as well as the physical socket.

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Chipset
AMD B550
Conditions & context

Manufacturer specification

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Form factor
ATX: 305 × 244 mm
Conditions & context

Manufacturer specification · Board dimensions, not retail packaging. Check case mounting positions, clearance and cable routing.

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Memory type, slots and limit
4 DDR4 DIMM slots; up to 128 GB; dual-channel unbuffered memory; A-XMP
Conditions & context

Manufacturer specification · Manufacturer capacity ceiling for this exact board, not included memory or a performance measurement. CPU, BIOS, DIMM population and the validated-module list determine support. DDR4 slots require DDR4 modules; DDR4 and DDR5 are not interchangeable.

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Storage interfaces
M2_1: CPU PCIe 4.0/3.0 x4 or SATA; M2_2: chipset PCIe 3.0 x4; 6 SATA 6 Gb/s ports
Conditions & context

Manufacturer specification · M.2 generation depends on the CPU. A PCIe SSD installed in M2_2 disables PCI_E3.

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Network interfaces
Realtek RTL8111H 1 Gb Ethernet
Conditions & context

Manufacturer specification · Confirmed wired networking; no installed wireless hardware is claimed.

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CPU support / BIOS source
MSI lists Ryzen 5000 / 3000 (excluding Ryzen 5 3400G and Ryzen 3 3200G) / 4000 G-Series processors. Check the exact CPU support list and required BIOS before purchase; a socket match alone does not establish out-of-box compatibility.
Conditions & context

Manufacturer specification

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Maximum listed memory
128 GB
Conditions & context

Manufacturer specification · Manufacturer capacity ceiling for this exact board, not included memory or a performance measurement. CPU, BIOS, DIMM population and the validated-module list determine support. DDR4 slots require DDR4 modules; DDR4 and DDR5 are not interchangeable.

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DIMM slots
4
Conditions & context

Manufacturer specification · Physical DDR4 module positions, not included modules. Consult the board manual for population order and compatible capacities.

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Onboard M.2 storage slots
2
Conditions & context

Manufacturer specification · Onboard M.2 storage positions only. M.2 generation depends on the CPU. A PCIe SSD installed in M2_2 disables PCI_E3.

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SATA storage ports
6
Conditions & context

Manufacturer specification · SATA 6 Gb/s connectors, not supplied drives or power cables. M.2 generation depends on the CPU. A PCIe SSD installed in M2_2 disables PCI_E3.

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Onboard audio hardware
Realtek ALC892 or ALC897
Conditions & context

Manufacturer specification · Manufacturer-listed onboard audio hardware, not a measured sound-quality result. Where alternatives are listed, no particular unseen controller revision is promised.

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PUT IT IN PERSPECTIVE

A choice needs a contender.

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