Gigabyte B550M K DDR4 AM4 M-ATX Motherboard Black
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Gigabyte B550M K — Value AM4 Platform with PCIe 4.0, Quad DDR4 & Dual M.2 Sockets
An essential and rock-solid Micro-ATX motherboard on AMD B550 for AMD Ryzen 5000, 4000 G-Series, and 3000 Series processors on Socket AM4. Features four DDR4 DIMM slots supporting up to 128 GB, a PCIe 4.0 x16 graphics slot, dual M.2 NVMe sockets (PCIe 4.0 x4 + PCIe 3.0 x2), Realtek Gigabit LAN, and an impressive rear I/O with eight USB ports.
Board Architecture Map
Key components across the compact B550 PCB
AMD AM4 PGA1331 Socket — Centre
Supports AMD Ryzen 5000, 4000 G-Series, and 3000 Series desktop processors with native PCIe 4.0 lanes.
Digital VRM Architecture — Top & Left
Clean power regulation utilizing low RDS(on) MOSFETs and solid capacitors for stable day-to-day operation.
4 × DDR4 DIMM Slots — Right
Dual-channel architecture supporting up to 128 GB total capacity and memory overclocking speeds up to 4733+ MHz (XMP).
PCIe 4.0 x16 Primary Graphics Slot — Centre
Direct-to-CPU PCIe 4.0 x16 slot with 64 GB/s theoretical bandwidth for modern gaming graphics cards.
Dual M.2 Sockets (M2A_CPU + M2B_SB) — Mid PCB
Primary PCIe 4.0 x4 M.2 slot directly wired to Ryzen CPU, plus secondary PCIe 3.0 x2 M.2 slot off the B550 chipset.
4 × SATA 6Gb/s Ports — Lower Left
Right-angled and upright SATA ports for traditional SSDs and high-capacity storage hard drives.
Power Delivery & Reliability
Solid hardware foundation designed for budget gaming and productivity buildsLow RDS(on) MOSFETs
Engineered to produce lower switching resistance for faster charging and lower heat generation across the PCB.
PCIe 4.0 x16 Full-Speed Graphics
Enables twice the bandwidth of older PCIe 3.0 slots, allowing modern GPUs to perform without interface bottlenecks.
Dual NVMe M.2 Storage Slots
Equipped with two M.2 slots allowing users to run a blistering PCIe 4.0 boot SSD alongside a secondary PCIe 3.0 storage drive.
Audio Noise Guard with LED Trace
Separates analog audio components from high-frequency PCB electromagnetic noise for clear voice chat and audio.
Bandwidth & Lane Hierarchy
Interface speed rating & capability relative to modern motherboard standardsRear I/O Bay
Port inventory: Everything on the panel, counted
Will It Fit Your Build?
Check these before you add to cartProcessor
Supports AMD Ryzen 5000, 4000 G-Series, and 3000 Series processors on Socket AM4.
Memory
DDR4 only — 4 DIMM slots supporting up to 128 GB and speeds up to 4733+ MHz with XMP.
Graphics
PCIe 4.0 x16 slot compatible with all modern dedicated graphics cards.
Storage
2 × M.2 sockets (1x PCIe 4.0 + 1x PCIe 3.0) plus 4 × SATA 6 Gb/s ports.
Case Clearance
Standard Micro-ATX form factor (24.4 cm x 24.4 cm) — fits Mini-Tower and Mid-Tower cases.
Power Supply
Requires standard 24-pin ATX power and a single 8-pin CPU 12V connector.
Full Specification Sheet
Gigabyte B550M K| Model | Gigabyte B550M K Motherboard |
| CPU Socket | AMD Socket AM4 (PGA 1331) |
| Supported Processors | AMD Ryzen 5000 / 4000 G-Series / 3000 Series Processors |
| Chipset | AMD B550 Chipset |
| Form Factor | Micro-ATX (24.4 cm x 24.4 cm) |
| Power Architecture | Digital VRM with Low RDS(on) MOSFETs |
| Memory Architecture | 4 × DDR4 DIMM, Dual Channel, up to 128 GB, XMP Support |
| Memory Frequency | Up to 4733+ MHz (O.C.) |
| Primary PCIe Slot | 1 × PCIe 4.0 x16 slot (requires Ryzen 5000/3000 CPU) |
| Secondary PCIe Slot | 1 × PCIe 3.0 x1 slot |
| M.2 NVMe Sockets | 2 × M.2 Sockets (1× PCIe 4.0 x4 + 1× PCIe 3.0 x2) |
| SATA Storage | 4 × SATA 6 Gb/s connectors with RAID 0/1/10 support |
| Display Outputs | 1 × DisplayPort 1.4 + 1 × HDMI 2.1 |
| USB Connectivity | 4 × USB 3.2 Gen 1 Type-A + 4 × USB 2.0 (8 USB ports on rear panel) |
| Wired Ethernet | Realtek GbE LAN chip (1 Gbps / 100 Mbps) |
| Audio Codec | Realtek HD Audio + Audio Noise Guard with Path Separation |
| Cooling Management | Smart Fan 5 with multiple temperature sensors and hybrid fan headers |
