Gigabyte B550M K AMD AM4 Micro-ATX Motherboard - B550, DDR4
GIGABYTE
Gigabyte B550M K AMD AM4 Micro-ATX Motherboard - B550, DDR4
The Gigabyte B550M K is a micro-ATX motherboard for AMD Ryzen 5000, 4000G and 3000-series processors. It's designed for budget-conscious builders who want PCIe 4.0 support and straightforward features without extra frills. It fits smaller cases while offering solid core performance and dual fast storage connectors.
Why this product
PCIe 4.0 ready for next-gen storage
One M.2 slot runs at PCIe 4.0 speeds with up to 64 Gb/s bandwidth, while a second slot runs at PCIe 3.0. Both support NVMe or SATA drives.
Compact micro-ATX form factor
Fits smaller cases and tighter builds without sacrificing core connectivity—one PCIe x16 slot, four SATA ports, and eight USB ports rear.
Smart Fan 6 with auto shutdown
Hybrid fan headers and multiple temperature sensors let you set aggressive cooling curves or silence fans entirely when load is light.
Four DDR4 slots, up to 128 GB
Dual-channel memory supports ECC and non-ECC DDR4 at JEDEC or overclocked speeds up to DDR4-4733.
Anti-sulfur resistors and surge protection
Designed to resist environmental corrosion and power spikes, with low-loss MOSFETs to cut heat and energy waste.
- ChipsetAMD B550
- Form FactorMicro-ATX
- CPU SocketAMD Socket AM4
- Memory Slots4 x DDR4 DIMM
- Max Memory128 GB
- PCIe Slots1 x PCIe 4.0 x16; 1 x PCIe x1
- M.2 Connectors2 (PCIe 4.0/3.0 x4 and PCIe 3.0 x2)
- SATA Ports4 x SATA 6Gb/s
- SKUGIG-2057
- EAN4719331852764
- Supports all AMD Ryzen 5000, Ryzen 5000G, Ryzen 4000G and Ryzen 3000/3000G processors in Socket AM4.
- Accepts any DDR4 DIMM up to 128 GB across four slots; ECC and non-ECC both work.
- PCIe 4.0 x16 slot works with modern graphics cards; also supports legacy PCIe 3.0 and earlier.
- Fits any micro-ATX case; not compatible with ATX, mini-ITX or E-ATX form factors.
- Both M.2 slots support NVMe or SATA mode, but the second slot runs at PCIe 3.0 x2, not x4—slower than the first.
Best for
- Budget builders upgrading from older Ryzen systems who need PCIe 4.0 without paying for extra features.
- Small-form-factor builds where micro-ATX is the limiting size and ATX boards won't fit.
- Users prioritising storage speed via the primary PCIe 4.0 M.2 slot and willing to use the second slot for slower secondary drives.
- Overclockers with modest budgets; solid power delivery and BIOS tuning tools support CPU and memory tweaking.
Trade-offs
- ATX case builders: This is micro-ATX only and will not mount in standard ATX cases.
- High-end gaming or workstations: Single PCIe x16 slot and limited rear I/O compared to larger boards may bottleneck multiple graphics cards or heavy peripheral expansion.
- Dual-fast-storage setups: The second M.2 slot runs at PCIe 3.0 x2 bandwidth, not x4, making it unsuitable for a second high-speed NVMe drive.
- Systems requiring seven or more SATA drives: Only four SATA ports onboard.
AMD B550 Ultra Durable Motherboard with Digital VRM Solution, PCIe 4.0 x16 Slot, Dual PCIe 4.0/3.0 M.2 Connectors, GbE LAN, Smart Fan 6 with FAN STOP
Supports AMD Ryzen™ 5000 Series/ Ryzen™ 5000 G-Series/ Ryzen™ 4000 G-Series and Ryzen™ 3000 and Ryzen™ 3000 G-Series Processors
Dual Channel ECC/ Non-ECC Unbuffered DDR4, 4 DIMMs
PCIe 4.0 x16 slot with faster bandwidth and lower impedance.
M.2 PCIe 4.0 x4 slot with Lower impedance.
With NVMe PCIe 4.0*/3.0 x4 and PCIe 3.0 x2 M.2 connectors onboard, GIGABYTE Motherboards bring users to experience NVMe mode or SATA mode connectivity for M.2 SSD devices. Delivering up to 64 Gb/s data transfer speed, the dual M.2 connectors design provides an ideal storage solution while also supporting in RAID modes.
GbE LAN features a network bandwidth management application which helps to improve network latency and maintain low ping times to deliver better responsiveness in crowded LAN environments.
GIGABYTE motherboards use high-end audio capacitors. These high quality capacitors help deliver high resolution and high fidelity audio to provide the most realistic sound effects for gamers.
GIGABYTE motherboards feature an audio noise guard that essentially separates the board's sensitive analog audio components from potential noise pollution at the PCB level.
B550 motherboards feature solid plated ATX 12V 8pin power connectors for offering stable power supply while CPU overloading.
Sulfur compounds in the air can penetrate tiny onboard resistors creating chemical change and causing these resistors to open or short. If either of these occurs the motherboard will fail to function. By equipping resistors with an Anti-Sulfur Design GIGABYTE gives Ultra Durable Motherboards a whole new meaning.
GIGABYTE motherboards also feature special anti-surge ICs that protect your motherboard, and your PC from any surge in power delivery that may occur, helping to ensure that your PC is equipped to deal with any potentially irregular and inconsistent power.
GIGABYTE motherboards use Low RDS(on) MOSFETs which reduce energy wastage through unnecessary residual heat dissipation. This all amounts to tangible energy savings which are beneficial for both end-users and the environment without impacting system performance.
The BIOS is essential for users during initial setup to allow for the most optimal settings. With a new GUI and easier to use functionalities, GIGABYTE has been able to reinvent the BIOS to give users a better experience while setting up their new system.
GIGABYTE APP CENTER is an useful portal of all GIGABYTE MB utilities and drivers, you can choose any utility you want to install from APP CENTER and keep you updated with latest utilities and drivers version.
General
| Brand | GIGABYTE |
|---|---|
| Chipset | AMD B550 |
| Form Factor | Micro-ATX |
CPU and Memory
| CPU Socket | AMD Socket AM4 |
|---|---|
| Supported Processors | AMD Ryzen 5000 Series, Ryzen 5000 G-Series, Ryzen 4000 G-Series, Ryzen 3000 and Ryzen 3000 G-Series |
| Memory Slots | 4 x DDR4 DIMM (Dual Channel) |
| Memory Type | ECC / Non-ECC Unbuffered DDR4 |
| Max Memory Speed | DDR4-4733 (O.C.) / DDR4-3200 (JEDEC) |
| Max Memory Capacity | 128 GB |
Storage and Expansion
| PCIe Slots | 1 x PCIe 4.0 x16 (CPU); 1 x PCIe x1 (Chipset) |
|---|---|
| M.2 Connectors | 1 x PCIe 4.0/3.0 x4 (NVMe/SATA); 1 x PCIe 3.0 x2 (NVMe/SATA) — both type 2280 |
| SATA Ports | 4 x SATA 6Gb/s |
Connectivity and Audio
| LAN | Realtek GbE with Bandwidth Management |
|---|---|
| USB (Rear) | 4 x USB 3.2 Gen 1; 4 x USB 2.0/1.1 |
| USB Headers (Internal) | 2 x USB 3.2 Gen 1; 2 x USB 2.0/1.1 |
| Video Output | 1 x DisplayPort 1.4; 1 x HDMI 2.1 |
| Audio | Realtek ALC892/ALC897; 2/4/5.1/7.1-channel HD Audio with Audio Noise Guard |
Power and Cooling
| CPU Power | ATX 12V 8-pin (solid plated) |
|---|---|
| Fan Headers | Smart Fan 6 with FAN STOP; Hybrid headers; Multiple temperature sensors |
BIOS and Features
| BIOS | GIGABYTE UEFI DualBIOS |
|---|
Shipping
All our products are shipped from the United Kingdom within 24 to 48 hours of purchase. See our Shipping and Returns page for full details.
Returns
- Tech Syndicate offers a full money-back guarantee on all purchases made in our store. If you are not satisfied with your purchase, we will provide a full refund, no questions asked.
- Refunds are available within 45 days of delivery.
- After the 45-day period you are no longer eligible for a refund, so we encourage you to try the product within the first few weeks to make sure it fits your needs.