MSI B550M-A PRO AM4 Micro ATX Motherboard Black
Installment Calculator
Interest-free with participating bank credit cards. Final terms confirmed at checkout.
Couldn't load pickup availability
Secure Payment Methods
Cash on delivery and various payment options and installment plans.
Fast and Secure Shipping
Receive your order within 2 to 5 business days.
Customer Service
Technical support from 10 am to 12 am.
Warranty Coverage
Enjoy a 6-month to 3-year warranty through us with distributors.
MSI B550M-A PRO — PCIe 4.0 Steel Armor, Lightning Gen4 M.2 & Core Boost on AMD AM4
A reliable, cost-effective Micro-ATX motherboard built on the AMD B550 chipset, engineered for AMD Ryzen 5000, 4000 G-Series, and 3000 Series desktop processors. Features a reinforced PCIe 4.0 x16 Steel Armor slot, Lightning Gen4 x4 M.2 NVMe storage, Core Boost digital power design, 2oz thickened copper PCB, and dual display outputs (HDMI 2.1 4K@60Hz and DVI-D).
Board Map
Every connector, located before you unbox
AMD Socket AM4 (PGA 1331) — Centre
Supports AMD Ryzen 5000, 4000 G-Series, and 3000 Series desktop processors (excluding 3400G/3200G) with proven stability and multi-core efficiency.
Core Boost Power Delivery — Top & Left
Digital PWM power architecture with premium layout delivers undisturbed, accurate current to the CPU pins.
2 × DDR4 DIMM Slots with DDR4 Boost — Right
Dual-channel DDR4 memory slots supporting up to 64 GB total capacity and extreme overclocked frequencies reaching 4600+ MHz (O.C.) with A-XMP.
PCIe 4.0 x16 Steel Armor Slot — Centre
Reinforced heavy-duty PCIe 4.0 x16 slot shielded with Steel Armor to prevent electromagnetic interference and physical sagging from modern GPUs.
Lightning Gen4 M.2 NVMe Socket — Below CPU
Direct-to-CPU PCIe 4.0 x4 M.2 slot delivering read/write bandwidth up to 64 Gbps for blazing-fast NVMe storage, also supporting SATA 6Gb/s SSDs.
1 × PCIe 3.0 x1 Expansion Slot — Lower Centre
Dedicated expansion slot for sound cards, Wi-Fi adapters, or capture cards.
4 × SATA 6Gb/s Ports — Lower Right
Four high-speed SATA revision 3.0 ports supporting RAID 0, RAID 1, and RAID 10 configurations for 2.5-inch SSDs and 3.5-inch hard drives.
AMD B550 Chipset Heatsink — Lower Right
Dedicated low-profile aluminum heatsink ensuring cool, silent, and reliable chipset operation under continuous workload.
Audio Boost Isolated PCB — Lower Left
Dedicated audio hardware zone with high-grade capacitors and isolated analog circuitry powered by the Realtek ALC892/ALC897 HD audio processor.
EZ Debug LED Indicators — Top Right Edge
Four onboard diagnostic status LEDs (CPU, DRAM, VGA, BOOT) indicating the exact source of trouble for quick troubleshooting.
Power Delivery & Engineering
What feeds the socket, and what keeps it steady
Core Boost Digital Power Architecture
Combines MSI premium power layout and fully digital power design to deliver faster and undistorted current to the CPU with pin-point precision, creating the perfect condition for multi-core CPUs.
PCIe Steel Armor Protection
MSI PCIe Steel Armor slots are secured to the motherboard with additional solder points to support the weight of heavy graphics cards and shield the PCIe signals against electromagnetic interference.
2oz Thickened Copper PCB
An enhanced printed circuit board design with 2oz thickened copper increases thermal conductivity, improving heat dissipation and performance reliability under continuous compute sessions.
Dual Display Outputs (HDMI 2.1 & DVI-D)
Ready for dual-monitor productivity straight from Ryzen processors with integrated graphics, featuring HDMI 2.1 capable of crisp 4K UHD at 60Hz and legacy DVI-D.
Lane Map
Interface speed rating & capability relative to modern motherboard standardsRear I/O Bay
Exactly what appears on the back of your case
Will It Fit Your Build?
Check these compatibility details before you buildProcessor Compatibility
Supports AMD Ryzen 5000, 4000 G-Series, and 3000 Series desktop processors on socket AM4. (Note: Not compatible with Ryzen 5 3400G and Ryzen 3 3200G).
Memory Requirements
DDR4 Only — 2 DIMM slots supporting up to 64 GB total capacity and frequencies up to 4600+ MHz (O.C.) via A-XMP profiles.
Graphics Card Fit
Features a PCIe 4.0 x16 slot reinforced with Steel Armor to firmly seat modern dedicated graphics cards.
Storage Drives
Includes 1 × Lightning Gen4 M.2 slot (PCIe 4.0 x4 & SATA compatible) plus 4 × SATA 6Gb/s ports.
Case Form Factor
Compact Micro-ATX form factor (23.6 cm × 20.0 cm) that easily fits in all standard Micro-ATX and Mid-Tower ATX PC cases.
Power Supply Connection
Requires standard 24-pin ATX main power and 1 × 4-pin ATX 12V CPU power connector.
Technical Specifications
Official factory engineering datasheet| CPU Socket | AMD Socket AM4 (PGA 1331) |
| Chipset | AMD B550 Chipset |
| Form Factor | Micro-ATX (23.6 cm × 20.0 cm / 9.3 in. × 7.9 in.) |
| Supported Processors | AMD Ryzen 5000, 4000 G-Series, and 3000 Series (excl. 3400G/3200G) |
| Memory Architecture | 2 × DDR4 DIMM slots, Dual Channel |
| Max Memory Capacity | 64 GB (DDR4-1866 up to 4600+ MHz O.C. via A-XMP) |
| Primary Graphics Slot | 1 × PCIe 4.0 / 3.0 x16 (MSI Steel Armor) |
| Secondary PCIe Slot | 1 × PCIe 3.0 x1 |
| M.2 Storage Slot | 1 × M.2 Socket (Key M, PCIe 4.0/3.0 x4 & SATA 6Gb/s, 2242/2260/2280) |
| SATA Ports | 4 × SATA 6 Gb/s (supports RAID 0, RAID 1, RAID 10) |
| Ethernet Controller | Realtek RTL8111H Gigabit LAN (1 Gbps) |
| Audio System | Realtek ALC892 / ALC897 7.1-Channel HD Audio with Audio Boost |
| Display Outputs | 1 × HDMI 2.1 (up to 4K @ 60Hz), 1 × DVI-D (up to 1920×1200 @ 60Hz) |
| Rear USB Ports | 4 × USB 3.2 Gen 1 (5Gbps Type-A), 2 × USB 2.0 Type-A |
| Internal USB Headers | 1 × USB 3.2 Gen 1 header (2 ports), 2 × USB 2.0 headers (4 ports) |
| Power Connectors | 1 × 24-pin ATX power, 1 × 4-pin ATX 12V CPU power |
