Overview
The GIGABYTE B550M K is a micro-ATX motherboard designed for desktop systems using compatible AMD Ryzen processors with the AM4 socket. Built around the AMD B550 chipset, it provides processor, memory, storage, networking, and expansion connectivity for general-purpose PCs and productivity systems.
The motherboard supports up to 128 GB of dual-channel DDR4 memory across four DIMM slots. Storage connectivity includes two M.2 connectors and four SATA 6 Gb/s ports, allowing compatible SSDs and SATA drives to be installed in the same system.
Expansion options include a CPU-connected PCIe x16 slot and a chipset-connected PCIe 3.0 x1 slot. Rear connectivity includes Gigabit Ethernet, USB ports, DisplayPort, HDMI, and audio connections. The display outputs require a compatible processor with integrated Radeon graphics.
Before deployment, confirm the motherboard revision, processor support, BIOS compatibility, and memory configuration against GIGABYTE’s official documentation.
Key Features
AMD B550 chipset with an AM4 processor socket.
Four DDR4 memory slots support up to 128 GB of RAM.
Dual M.2 connectors support compatible SSD configurations.
Four SATA 6 Gb/s ports support additional storage drives.
Micro-ATX design includes PCIe expansion and Gigabit LAN.
Technical Specifications
| Specification | Details |
|---|
| Brand | GIGABYTE |
| Part Number | B550M K |
| Product Type | Micro-ATX motherboard |
| Chipset | AMD B550 |
| CPU Socket | AMD AM4 |
| Processor Support | Compatible Ryzen 5000, 5000 G-Series, 4000 G-Series, 3000, and 3000 G-Series processors; check CPU support list |
| Memory Slots | 4 × DDR4 DIMM |
| Maximum Memory Capacity | 128 GB |
| Memory Architecture | Dual-channel |
| Primary Expansion Slot | 1 × CPU-connected PCIe x16 |
| Additional Expansion Slot | 1 × PCIe 3.0 x1 |
| M.2 Connectors | 2 × M.2 Key M, Socket 3, type 2280 |
| SATA Connectivity | 4 × SATA 6 Gb/s |
| Network Interface | Realtek Gigabit Ethernet |
| Display Outputs | 1 × DisplayPort; 1 × HDMI |
| Audio | Realtek audio codec; HD audio with up to 7.1-channel configuration |
| Form Factor | Micro-ATX |
| Dimensions | 24.4 × 24.4 cm |
Product Note
Confirm the motherboard revision (such as Rev. 1.0, 1.1, or 1.2) before ordering because support documentation can differ by revision. Processor compatibility and the available PCIe and M.2 operating modes depend on the installed CPU. DisplayPort and HDMI output require a supported processor with integrated graphics; the motherboard does not independently generate video.
What is the GIGABYTE B550M K?
It is a micro-ATX desktop motherboard featuring the AMD B550 chipset and AM4 socket for compatible AMD Ryzen processors.
Which processors does it support?
GIGABYTE lists compatible Ryzen 5000, Ryzen 5000 G-Series, Ryzen 4000 G-Series, Ryzen 3000, and Ryzen 3000 G-Series processors. Check the official CPU support list for exact models and BIOS requirements.
How much RAM can the motherboard support?
It has four DDR4 DIMM slots and supports up to 128 GB of system memory. Supported memory speeds depend on the processor, memory modules, and system configuration.
How many SSDs and hard drives can be installed?
The board provides two M.2 connectors and four SATA 6 Gb/s ports. Supported M.2 drive interfaces and speeds vary by connector and processor.
Does the B550M K include Wi-Fi?
The published specifications for the standard B550M K list Gigabit Ethernet but do not list built-in Wi-Fi. Do not confuse it with separately named wireless motherboard variants.
Can it run a monitor without a dedicated graphics card?
Yes, provided the installed processor has supported integrated Radeon graphics. Processors without integrated graphics require a compatible discrete graphics card for display output.
