MSI B550‑A PRO AM4 ATX Motherboard – PCIe 4.0, Dual M.2, DDR4
MSI B550‑A PRO
Build a stable and high‑performance AM4 system with the MSI B550‑A PRO, an ATX motherboard engineered for gaming, productivity, and professional workloads. Powered by the AMD B550 chipset, it supports Ryzen 3000 / 4000G / 5000 Series processors and delivers fast DDR4 performance up to 4400+ MHz (OC). With PCIe 4.0 x16 GPU support, dual M.2 slots, USB 3.2 Gen2, and enhanced power delivery, this board provides a reliable and efficient platform for modern AM4 builds.
MSI’s PRO Series features such as Core Boost, M.2 Shield Frozr, PCI‑E Steel Armor, and Flash BIOS Button ensure easy installation, long‑term durability, and stable performance for gaming and workstation systems.
Specifications
Type: ATX Motherboard
Brand: MSI
Model: B550‑A PRO
Chipset: AMD B550
CPU Socket: AM4
Supported CPUs: Ryzen 3000 / 4000G / 5000 Series (with integrated graphics for display output
RAM Type: DDR4 (Dual Channel)
RAM Slots: 4 × 288‑pin
RAM Speed Support: Up to DDR4‑4400+ (O.C.)
Max Memory: 128GB
PCIe Slots:
1 × PCIe 4.0 x16 (GPU slot)
1 × PCIe 3.0 x16 (x4 mode)
2 × PCIe 3.0 x1
M.2 Slots: 1 × PCIe 4.0 x4 (CPU) – NVMe SSD 1 × PCIe 3.0 x4 (Chipset) – NVMe SSD
SATA Ports: 6 × SATA 6Gb/s
RAID Support: RAID 0/1/10 (SATA)
LAN: Realtek Gigabit LAN (1GbE)
Wireless: No onboard Wi‑Fi (supports Wi‑Fi cards)
Audio Codec: Realtek ALC892 / ALC897
Channels: 7.1‑Channel High Definition Audio
Video Outputs (Requires Ryzen CPU with integrated Radeon Graphics)
1 × HDMI
1 × DisplayPort
USB Connectivity
Rear I/O
USB‑C (USB 3.2 Gen2)
USB‑A (USB 3.2 Gen2)
USB‑A (USB 3.2 Gen1)
USB‑A (USB 2.0)
HDMI
DisplayPort
LAN
Audio jacks
Flash BIOS Button
PS/2 Combo Port
Internal Headers
USB 3.2 Gen1 header
USB 2.0 header
RGB/ARGB headers
Front panel connectors
TPM header
Multiple fan headers
Power Connectors: 24‑pin ATX, 8‑pin CPU power
Form Factor: ATX (305 × 244 mm)
Most Suitable For
Mid‑range to high‑performance AM4 gaming PCs
Ryzen 3000 / 4000G / 5000 Series builds
Workstation & productivity systems
PCIe 4.0 GPU + NVMe storage setups