MSI B550M-A PRO Micro-ATX Motherboard AMD Socket AM4 AMD B550 Chipset — Supports Ryzen 5000/4000/3000 Series CPUs (excluding Ryzen 5 3400G & 3 3200G), 2x DDR4 Slots up to 64GB 4600 MHz (OC), PCIe 4.0 x16, 1x M.2 PCIe 4.0 Slot, 4x SATA 6Gb/s, Realtek A

General Information

The MSI B550M-A PRO is a solid mid-range Micro-ATX motherboard designed for AMD AM4 platform builds, supporting Ryzen 5000, 4000, and 3000 series processors, excluding the Ryzen 5 3400G and Ryzen 3 3200G APUs. It offers PCIe 4.0 x16 GPU support, DDR4-4600+ OC speeds, and modern connectivity, making it ideal for gaming rigs, content creation workstations, and productivity systems.

With Core Boost digital power design, Realtek ALC897 audio, and RAID support, this board provides a reliable foundation for stable performance and easy upgrades.

CPU & Chipset

• Socket: AM4 – supports:
  • AMD Ryzen™ 5000, 4000, 3000 series (Zen 3, Zen 2, Zen+)
  • AMD Athlon™, APU (if compatible)
  • Excludes: Ryzen 5 3400G, Ryzen 3 3200G
• Chipset: AMD B550 – mid-range chipset with full PCIe 4.0 support
• Memory Support:
  • 2 x DDR4 DIMM slots – dual-channel architecture
  • Max Capacity: 64GB (2x 32GB)
  • Speeds: Up to 4600+ MHz (OC) via XMP
  • Types: Non-ECC, ECC, unbuffered DDR4
  • Features:
    • XMP support for easy overclocking
    • DIMM Flex & DIMM Fit for optimal slot compatibility

Graphics & Display Output

• Integrated Graphics: Supports AMD Radeon Graphics (based on CPU)
• Display Outputs (Back Panel):
  • 1 x HDMI 2.1 – supports 4K@60Hz (with HDR)
  • 1 x DVI-D – supports 1920x1200@60Hz
• Multi-Monitor Support:
  • Can drive up to 2 displays simultaneously (HDMI + DVI)
• Note: For high-performance gaming, a discrete GPU is recommended.

Expansion & Connectivity

• PCIe Slots:

  • 1 x PCIe 4.0/3.0 x16 – for next-gen GPUs (supports x16 or x8/x8 modes)
  • 1 x PCIe 3.0 x16 – for expansion cards (sound, capture, etc.)

• Storage Options:

  • 1 x M.2 slot (Key M) – supports NVMe SSDs:
    • M.2_1: PCIe 4.0 x4 (max 64 Gbps)
    • SATA 6Gb/s – for HDDs, SSDs, optical drives
  • 4 x SATA 6Gb/s ports – for HDDs, SSDs, optical drives

• RAID Support:

  • AMD RAIDXpert2 Technology – supports RAID 0/1/10
  • Some PCIe slots share bandwidth with SATA ports

Networking & Wireless

• Ethernet:
  • 1 x Realtek RTL8111H Gigabit LAN – wired gigabit connectivity
  • Supports WOL (Wake-on-LAN) and PXE boot
• Wireless:
  • No built-in Wi-Fi or Bluetooth – requires add-on card or USB adapter
  • Thunderbolt 4 header can support Wi-Fi via Thunderbolt card

USB Ports

• Rear I/O:
  • 4 x USB 3.2 Gen 1 Type-A (5 Gbps)
  • 2 x USB 2.0 Type-A (5 Gbps)
• Front Panel Headers:
  • 1 x USB 3.2 Gen 1 header (supports 2 x USB 3.2 Gen 1 ports)
  • 2 x USB 2.0 headers (supports 3 x USB 2.0 ports)

Cooling & Thermal Management

• VRM Heatsinks:
  • Large VRM heatsink for stable power delivery
  • PCH (Platform Controller Hub) heatsink for thermal regulation
• Fan Control:
  • Smart Fan 6 – automatic fan curve optimization
  • 5 x 4-pin Chassis Fan headers
  • 1 x 4-pin CPU Fan header
  • 1 x 4-pin CPU OPT Fan header
  • 1 x 4-pin AIO Pump header

RGB & Lighting

• RGB Headers:
  • 3 x Addressable Gen 2 RGB headers – compatible with MSI Mystic Light
  • 1 x Standard RGB header – for basic lighting effects
• Control Software:
  • MSI Mystic Light – customizable lighting effects and synchronization

Protection & Build Quality

• MSI 5X Protection:
  • DIGI+ VRM – digital power design with DrMOS
  • ESD Guards – protection against electrostatic discharge
  • LANGuard – network surge protection
  • Overvoltage Protection
  • SafeSlot – reinforced PCIe slot
  • Stainless-steel back I/O shield
• Build Material:
  • High-quality PCB with 6-layer design
  • Reinforced chassis and connectors

Special Features

• MSI Q-Design:
  • Q-Flash Plus – update BIOS without CPU or memory
  • EZ-Latch – tool-less PCIe slot
  • Q-DIMM – secure DIMM slot design
  • Q-Connector – simplified cable routing
  • Q-Dashboard – system monitoring
• ASUS EZ DIY:
  • BIOS FlashBack™ button – update BIOS without a CPU
  • Clear CMOS button
  • Pre-mounted I/O shield
  • SafeDIMM – prevents accidental DIMM removal
• ASUS Thermal Solution:
  • M.2 heatsink backplate
  • M.2 heatsink
  • VRM heatsink design