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Green Micro ATX motherboard with silver heatsinks and rear I/O shield

MSI

MSI PRO B550M-P WIFI6E AMD motherboard

SKU CH-3ZFQ-6XAG3 MPN PRO B550M-P WIFI6E

Micro-ATX AM4 board supports Ryzen 3000, 4000 G-Series and 5000 CPUs with four DDR4 slots up to 128 GB at 4400 MT/s, PCIe 4.0 x16 plus dual M.2, Wi-Fi 6E and Bluetooth 5.3

  • CPU Socket TypeAM4
  • CPU TypeRyzen 5000 Series, Ryzen 4000 G-Series, Ryzen 3000 Series
  • ChipsetAMD B550
  • Number of Memory Slots4x288pin (DDR4)
  • Memory StandardDDR4 4400
  • Maximum Memory Supported128GB

Option B550M-P WIFI 6E

Struck-through versions exist but are not stocked here.

  • Supports Ryzen 5000, 4000 G-Series and 3000 Series CPUs on AM4 socket
  • DDR4 memory up to 128 GB at 4400 MT/s across four DIMM slots
  • PCIe 4.0 x16 Steel Armor slot plus dual M.2 with Gen4 x4 support
  • Wi-Fi 6E and Bluetooth 5.3 with Realtek 1 GbE LAN for wireless and wired networking
  • HDMI 2.1, DisplayPort 1.4, VGA and front USB-C on rear I/O with 7.1-channel audio

AM4 Ryzen platform

The MSI PRO B550M-P WIFI6E is an AMD B550 Micro ATX motherboard built for socket AM4 processors. It supports Ryzen 5000 Series, Ryzen 4000 G-Series and Ryzen 3000 Series CPUs. The board targets builders who want a compact foundation for a modern desktop without moving to a newer socket. Dual-channel DDR4 memory and integrated wireless give it broad everyday utility.

PCIe 4.0 x16 primary slot

The single PCI Express 4.0 x16 slot is the specification that decides graphics and high-bandwidth add-in card compatibility. It runs at Gen4 speeds with a compatible Ryzen 5000 or 4000 G-Series processor. A second full-size slot operates at PCI Express 3.0 x16 electrical, while two x1 slots handle smaller expansion cards. This layout fixes the upgrade ceiling for GPUs and capture devices.

128 GB DDR4 4400 headroom

Four 288-pin DIMM slots accept up to 128 GB of unbuffered non-ECC DDR4 at 4400 MT/s overclocked. Dual-channel operation keeps throughput high for multitasking and content creation. Two M.2 sockets provide fast storage; one supports PCIe 4.0 x4 and the other PCIe 3.0 x4. Four SATA 6Gb/s ports add bulk capacity. The Realtek ALC897 codec delivers 7.1-channel audio, while Wi-Fi 6E and Bluetooth 5.3 handle wireless.

Highlights

  • Supports Ryzen 5000, 4000 G-Series and 3000 Series CPUs on AM4 socket
  • DDR4 memory up to 128 GB at 4400 MT/s across four DIMM slots
  • PCIe 4.0 x16 Steel Armor slot plus dual M.2 with Gen4 x4 support
  • Wi-Fi 6E and Bluetooth 5.3 with Realtek 1 GbE LAN for wireless and wired networking
  • HDMI 2.1, DisplayPort 1.4, VGA and front USB-C on rear I/O with 7.1-channel audio

Specifications

BrandMSI
ModelPRO B550M-P WIFI6E
CPU Socket TypeAM4
CPU TypeRyzen 5000 Series, Ryzen 4000 G-Series, Ryzen 3000 Series
ChipsetAMD B550
Number of Memory Slots4x288pin (DDR4)
Memory StandardDDR4 4400
Maximum Memory Supported128GB
Channel SupportedDual Channel
Memory Performance ProfileIntel XMP
ECC SupportedNon-ECC
Buffer SupportedUn-buffered
PCI Express 4.0 x161 x PCI Express 4.0 x16
PCI Express 3.0 x161 x PCI Express 3.0 x16
PCI Express x161 x PCI Express x16
PCI Express x12 x PCI Express x1
Serial ATA (SATA)4 x SATA 6Gb/s
M.22 x M.2 (Support PCIe 4.0 x4 & SATA)
SATA RAID0/1/10
Audio ChipsetRealtek ALC897
Audio Channels7.1 Channels
LAN ChipsetRealtek RTL8111H
Max LAN Speed1Gbps
Wireless LANWiFi IEEE 802.11 a / b / g / n / ac / ax
BluetoothYes
PS/21 x PS/2 keyboard/mouse port
COM1
Video PortsD-Sub + Display Port + HDMI
S-VideoNo
HDMI1 x HDMI
RJ451 x RJ45
DisplayPort1 x DisplayPort
USB 3.17 x USB 3.1
USB 3.07 x USB 3.0
USB 1.1/2.04 x USB 3.0 + 6 x USB 2.0
USB Type-C1 x USB 5Gbps Type-C
Audio Ports3 Ports
Onboard USB2 x USB 3.2 + 4 x USB 2.0 + 1 x USB Type-C® header, with USB 3.2 Gen 1
Form FactorMicro ATX
LED LightingNone RGB
Dimensions (W x L)243.84mm x 243.84mm
Power Pin24 Pin
Windows 11Supported
Shipping weight1.27 kg
Package size284 × 274 × 89 mm

Other versions of this model

5 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

What does the DDR4 4400 rating mean once the board is installed in a real system?

The board supports DDR4 memory up to 4400 MT/s when overclocked, with four 288-pin slots running in dual-channel mode for a maximum of 128 GB using non-ECC unbuffered modules.

What interface standard does the primary M.2 slot use and what does that cap in practice?

The first M.2 slot connects via PCIe 4.0 x4, delivering up to 64 Gbps bandwidth for compatible drives, while the second slot operates at PCIe 3.0 x4 speeds.

What does the board physically need to fit or mount inside a case?

It uses the Micro-ATX form factor with an AM4 socket, four DDR4 DIMM slots, one PCIe 4.0 x16 slot with Steel Armor, one PCIe 3.0 x16 slot, two PCIe x1 slots, dual M.2 sockets and standard I/O shield cut-outs.

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