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MSI PRO B550M-P GEN3 Motherboard Micro-ATX AM4 — main product image
MSI PRO B550M-P GEN3 Motherboard Micro-ATX AM4
MSI PRO B550M-P GEN3 Motherboard Micro-ATX AM4
MSI PRO B550M-P GEN3 Motherboard Micro-ATX AM4
MSI PRO B550M-P GEN3 Motherboard Micro-ATX AM4
MSI PRO B550M-P GEN3 Motherboard Micro-ATX AM4
MSI PRO B550M-P GEN3 Motherboard Micro-ATX AM4
MSI

MSI PRO B550M-P GEN3 Motherboard Micro-ATX AM4

★★★★★4.1 (86 reviews)
4KUSB 3.2HDMI 1.4

A compact, Ryzen-ready Micro-ATX motherboard with DDR4 Boost and M.2 storage for budget-conscious PC builders.

$113.99*$119.90Save 4%
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*Price sourced from Amazon.com. Last updated:Jun 04, 2026.Price and availability are subject to change.

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Overview

The MSI PRO B550M-P GEN3 is a Micro-ATX motherboard built around the AMD B550 chipset, targeting builders who want a reliable AM4 platform without paying for features they may not need. It supports the full range of compatible Ryzen processors, including the Ryzen 5000 series, and offers four DDR4 DIMM slots with MSI's DDR4 Boost technology for stable memory performance at speeds up to 4400 MHz and beyond when overclocked. The board includes a single PCIe 3.0 x16 expansion slot and one M.2 Gen3 slot for NVMe storage, covering the essentials for a focused build.

Rear connectivity includes USB 3.2 Gen 1 Type-A ports, 7.1-channel HD audio, and Gigabit Ethernet. Three display outputs — HDMI 1.4, DVI-D, and VGA — make this board particularly practical for APU-based systems where a discrete GPU isn't in the plan. The Micro-ATX footprint keeps it compact enough for smaller chassis while still offering enough expansion for most mainstream use cases. This is a straightforward, well-executed board for users who prioritize stability and value over cutting-edge features like PCIe 4.0 or Wi-Fi.

Key Features

RYZEN 5000 READY, RELIABLE PERFORMANCE - The PRO B550M-P GEN3 is a compact micro-ATX (mATX) motherboard outfitted with the latest AMD B550 chipset (AM4, Ryzen 5000 ready); The VRM features MSI Core Boost technology for improved stability & performance

COOLING FEATURES - The VRM & chipset heatsinks provide passive cooling; System cooling settings can be adjusted both in BIOS or through MSI Center software

DDR4 MEMORY, PCIe 3.0 x16 SLOT - 4 x DDR4 DIMM slots feature DDR4 Boost isolated circuitry for overclocking (1DPC 1R, 4400+ MHz); A PCIe 3.0 x16 Steel Armor slot supports heavy model graphics cards

GEN3 M.2 CONNECTOR - Storage includes a M.2 Gen3 x4 32Gb/s slot (supports SATA 6Gb & 2242, 2260, 2280 storage devices)

WELL CONNECTED - Network hardware includes a Gigabit LAN controller; Rear ports include 2 x USB 3.2 Gen 1 Type-A (5Gb/s), 7.1 HD Audio with Audio Boost, HDMI 1.4 (4K/30Hz), DVI-D, and legacy VGA

Specifications

Form Factor
Micro-ATX
CPU Socket
AM4 (AMD Ryzen 5000 Ready)
Chipset
AMD B550
Memory
4 x DDR4 DIMM, DDR4 Boost 4400+ MHz (OC)
Expansion Slots
PCIe 3.0 x16
Storage
1 x M.2 Gen3 Slot
LAN
1 Gigabit Ethernet
Rear Ports
USB 3.2 Gen 1 Type-A, HDMI 1.4, DVI-D, VGA
Audio
7.1 HD Audio

Pros & Cons

👍 Pros

  • Compact Micro-ATX form factor fits smaller cases while retaining four DDR4 DIMM slots.
  • DDR4 Boost technology helps stabilize high-frequency memory overclocks.
  • Three onboard video outputs (HDMI, DVI-D, VGA) provide flexible display options with Ryzen APUs.
  • Budget-friendly B550 platform with M.2 Gen3 NVMe support for fast storage.
  • Ryzen 5000 series ready, supporting current-generation AM4 processors.

👎 Cons

  • PCIe slots are limited to Gen3 speeds, missing out on the Gen4 bandwidth the B550 chipset can support.
  • Only one M.2 slot, which limits NVMe expansion without an add-in card.
  • HDMI output is capped at version 1.4, restricting 4K output to 30Hz.
  • No built-in Wi-Fi or Bluetooth; a separate adapter is required for wireless connectivity.

Frequently Asked Questions

This motherboard supports AMD Ryzen 5000, 4000 G-Series, and 3000 series processors via its AM4 socket. A BIOS update may be required for newer CPUs.
No. Despite using the B550 chipset, this GEN3 variant routes its primary x16 slot and M.2 slot at PCIe 3.0 speeds only.
It has one M.2 Gen3 slot for NVMe or SATA SSDs.
The board provides HDMI 1.4, DVI-D, and VGA outputs, which are active only when using a Ryzen APU with integrated graphics.
It supports DDR4 speeds up to 4400 MHz or higher when overclocked, across four DIMM slots.

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