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Black ATX motherboard with silver heatsinks and a grey PCIe slot

MSI

MSI MPG B550 GAMING PLUS AMD motherboard Socket AM4 DDR4 128GB ATX

SKU CH-3F67-4MS8K

ATX board for AM4 Ryzen CPUs with dual-channel DDR4 up to 128GB and PCIe 4.0 x16 slot

  • CPU Socket TypeSocket AM4
  • CPU TypeSupports AM4 socket 3rd Gen AMD Ryzen processors, and future
  • ChipsetAMD B550
  • Memory StandardSupport dual-channel DDR4 1866/2133/2400/2667/2800/2933/3000
  • Maximum Memory Supported128GB
  • PCI Slots1x PCIe 4.0/ 3.0 x16 slot (PCI_E1) 1x PCIe 3.0 x16 slot (PCI
  • Supports 3rd Gen Ryzen and future CPUs with BIOS update
  • Dual-channel DDR4 up to 4400 MHz for fast memory performance
  • 128 GB maximum capacity handles heavy workloads
  • PCIe 4.0 x16 slot enables high-speed graphics
  • 1-channel Realtek audio delivers immersive sound

Socket AM4 Platform

The MSI MPG B550 GAMING PLUS motherboard targets builders using third-generation AMD Ryzen processors and future AM4 CPUs with a BIOS update. It delivers a mainstream ATX foundation for gaming or productivity systems. The AMD B550 chipset handles core logic and I/O distribution. This board suits users who want current AM4 performance without moving to a newer socket.

ATX Layout and Rear I/O

Standard ATX dimensions fit common chassis and provide room for multi-GPU or add-in card configurations. The rear panel supplies four USB 2.0 Type-A ports plus a USB 3.2 Gen 1 Type-C internal header and two additional USB 3.2 Gen 1 ports via an internal connector. Gigabit LAN uses a Realtek 8111H controller. Audio relies on a Realtek ALC892/ALC897 codec with 7.1-channel output and S/PDIF. Six SATA III ports and two M.2 interfaces handle storage.

128GB DDR4 Ceiling

Four memory slots support dual-channel DDR4 at speeds from 1866 up to 4400+ MHz when overclocked. The maximum capacity is 128GB, which determines whether the board can meet heavy multitasking or content-creation workloads. Buyers needing more than 128GB must choose a different platform. This single limit decides if the product matches the intended build.

Highlights

  • Supports 3rd Gen Ryzen and future CPUs with BIOS update
  • Dual-channel DDR4 up to 4400 MHz for fast memory performance
  • 128 GB maximum capacity handles heavy workloads
  • PCIe 4.0 x16 slot enables high-speed graphics
  • 1-channel Realtek audio delivers immersive sound

Specifications

BrandMSI
SeriesMSI MPG B550 GAMING PLUS
ModelMSI MPG B550 GAMING PLUS
CPU Socket TypeSocket AM4
CPU TypeSupports AM4 socket 3rd Gen AMD Ryzen processors, and future AMD Ryzen processors with BIOS update
ChipsetAMD B550
Memory StandardSupport dual-channel DDR4 1866/2133/2400/2667/2800/2933/3000/3066/3200/3466/3600/3733/3866/4000/4133/4266/4400 + MHz memory
Maximum Memory Supported128GB
PCI Slots1x 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
SATA RAID2XM.2 interface, 6xSATA III interface
Audio ChipsetRealtek ALC892/ALC897 Codec
7.1-Channel High Definition Audio
Supports S/PDIF output
LAN Chipset1x Realtek 8111H Gigabit LAN controller
Onboard USBAMD 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

Questions about this item

What PCIe standard does the primary x16 slot use, and what speed does it cap at?

The primary PCI_E1 slot runs at PCIe 4.0 x16 with a Ryzen 3000 series CPU, or PCIe 3.0 x16 with older processors.

What case form factor and mounting pattern does this ATX board require?

It fits standard ATX cases with nine mounting holes and the regular I/O shield cut-out.

How is the CPU power connected, and which connector do builders often leave unplugged?

Plug the 8-pin EPS cable into the socket near the VRM heatsink; the 4-pin auxiliary beside it is optional and frequently missed.

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