GIGABYTE B550M K (rev. 1.1) Micro ATX Motherboard
The GIGABYTE B550M K (rev. 1.1) is a Micro ATX motherboard designed for AMD Ryzen processors, combining high-speed PCIe 4.0 performance, dual ultra-fast M.2 connectivity, enhanced audio, and durable hardware protection features.
Key Features
- CPU Support
- AMD Socket AM4
-
Supports:
- AMD Ryzen 5000 Series
- AMD Ryzen 5000 G-Series
- AMD Ryzen 4000 G-Series
- AMD Ryzen 3000 and Ryzen 3000 G-Series Processors
-
Memory
- Dual Channel ECC / Non-ECC Unbuffered DDR4
-
4 DIMM slots, up to 128 GB total
-
Graphics & Expansion
- Ultra Durable PCIe 4.0 Ready x16 Slot
-
Rear DisplayPort and HDMI for multi-display support
-
Storage
-
Dual ultra-fast NVMe PCIe 4.0/3.0 M.2 connectors
-
Networking
-
Realtek GbE LAN with bandwidth management
-
Audio
- High quality audio capacitors
-
Audio Noise Guard design for improved audio clarity
-
Cooling & Control
- Smart Fan 5 with multiple temperature sensors
-
Hybrid fan headers with FAN STOP for fan silence
-
Reliability & Protection
- Anti-Sulfur resistors design
- Surge and ESD protection
- Glass Fabric PCB for humidity protection
- Low RDS(on) MOSFETs for lower heat and energy efficiency
- Solid pin power connectors
- GIGABYTE patented double locking bracket
Performance
M.2 PCIe 4.0 Slot
- M.2 PCIe 4.0 x4 slot with lower impedance for high-speed SSD performance.
PCIe 4.0 Slot
- PCIe 4.0 x16 slot with faster bandwidth and lower impedance for discrete graphics and add-in cards.
Connectivity
Dual NVMe PCIe 4.0/3.0 M.2 Connectors
- NVMe PCIe 4.0/3.0 x4 and PCIe 3.0 x2 M.2 connectors.
- Supports NVMe or SATA mode connectivity for M.2 SSD devices.
- Delivers up to 64 Gb/s data transfer speed.
- Supports RAID modes for an ideal high-speed storage solution.
GbE LAN with Bandwidth Management
- Realtek GbE LAN with network bandwidth management application.
- Helps improve network latency and maintain low ping times in crowded LAN environments.
HDMI 2.1 & DisplayPort
- HDMI 2.1 with:
- Backward compatibility with HDMI 2.0 / 1.4
- Up to 48 Gb/s bandwidth
- Support for 4K / 60P, 21:9 native cinematic ratio, Full HDR and HDCP 2.3
- DisplayPort output for high-resolution display connectivity.
ESD & Surge Protection
- ICs with up to 3x the ESD resistance of traditional ICs.
- Special anti-surge ICs help protect motherboard and PC from electrical surges.
Cooling – Smart Fan 5
Smart Fan 5 ensures stable performance with advanced cooling control:
- 5 temperature sensors
- 2 fan pin headers
- All fan headers upgraded to hybrid fan headers
- Interoperable fans and sensors
- Intuitive user interface for fan control
FAN STOP
- Customizable fan stop feature:
- Map any fan to stop completely below a chosen temperature threshold.
- Configure which fan stops, based on which sensor, and at what temperature.
Hybrid Fan Pin Headers
- Real-time information on flow-rate and water temperature when using supported cooling.
- Automatically detect fan or pump and support both PWM and Voltage modes.
New Smart Fan 5 Software
- Multiple modes from Quiet to Full Speed.
- Intuitive fan curve configuration with temperature-triggered speed control.
Audio
High-End Audio Capacitors
- High-quality capacitors for high-resolution, high-fidelity audio.
- Delivers realistic sound effects suitable for gaming and multimedia.
Audio Noise Guard
- PCB-level isolation for analog audio components.
- Helps reduce noise interference for cleaner sound output.
Ultra Durable Design
GIGABYTE Patented Double Locking Bracket
- First lock: Inserted from the top for improved retention.
- Second lock: Soldered for a stronger mechanical bond.
Solid Pin Power Connectors
- Solid plated ATX 12V 8-pin power connector.
- Designed to offer stable power supply under CPU overloading.
Advantages: - Larger contact area for electricity - More metal to sustain higher power and heat - Enhanced durability and longer lifespan
Anti-Sulfur Resistors Design
- Resistors with Anti-Sulfur Design help prevent failures caused by sulfurization.
- Improves long-term reliability in harsh environments.
Surge Protection
- Special anti-surge ICs protect against irregular electrical spikes.
Humidity Protection – Glass Fabric PCB
- Glass Fabric PCB reduces spacing between PCB fiber weave.
- Makes moisture penetration more difficult compared to traditional PCBs.
- Offers improved protection against short circuits and system malfunctions caused by humidity.
High Temperature Protection – Low RDS(on) MOSFETs
- Low RDS(on) MOSFETs reduce energy wastage from residual heat.
- Contributes to energy savings without impacting performance.
Specifications
CPU
| Item | Details |
|---|---|
| Socket | AMD Socket AM4 |
| Supported CPUs | AMD Ryzen 5000 Series / Ryzen 5000 G-Series / Ryzen 4000 G-Series / Ryzen 3000 and Ryzen 3000 G-Series Processors |
Chipset
| Item | Details |
|---|---|
| Chipset | AMD B550 |
Memory
| Item | Details |
|---|---|
| Slots | 4 x DDR4 DIMM sockets |
| Max Capacity | Up to 128 GB (32 GB per DIMM) |
| Supported Speeds | DDR4 4733(O.C.) / 4600(O.C.) / 4400(O.C.) / 4266(O.C.) / 4133(O.C.) / 4000(O.C.) / 3866(O.C.) / 3733(O.C.) / 3600(O.C.) / 3466(O.C) / 3400(O.C.) / 3200 / 2933 / 2667 / 2400 / 2133 MHz |
| Architecture | Dual Channel |
| ECC Support | ECC Un-buffered DIMM 1Rx8/2Rx8 |
| Non-ECC Support | Non-ECC Un-buffered DIMM 1Rx8/2Rx8/1Rx16 |
| XMP | Support for Extreme Memory Profile (XMP) memory modules |
Onboard Graphics
| Item | Details |
|---|---|
| Integrated GPU | Integrated Graphics Processor with AMD Radeon Graphics support (CPU dependent) |
| DisplayPort | 1 x DisplayPort, max resolution 5120x2880@60 Hz |
| HDMI | 1 x HDMI port, max resolution 4096x2160@60 Hz |
Audio
| Item | Details |
|---|---|
| Codec | Realtek Audio CODEC |
| Audio Channels | High Definition Audio, 2/4/5.1/7.1-channel |
LAN
| Item | Details |
|---|---|
| Controller | Realtek GbE LAN chip |
| Speed | 1 Gbps / 100 Mbps / 10 Mbps |
Expansion Slots
| Slot | Details |
|---|---|
| PCIe x16 | 1 x PCI Express x16 slot (CPU integrated): • Ryzen 5000/3000 Series: PCIe 4.0 x16 mode • Ryzen 5000 G-/4000 G-/3000 G-Series: PCIe 3.0 x16 mode |
| PCIe x1 | 1 x PCI Express x1 slot (Chipset): PCIe 3.0 x1 mode |
Storage
| Connector | Details |
|---|---|
| M2A_CPU | 1 x M.2 Socket 3 (type 2280), CPU integrated: • Ryzen 5000/3000 Series: SATA and PCIe 4.0 x4/x2 SSDs • Ryzen 5000 G-/4000 G-/3000 G-Series: SATA and PCIe 3.0 x4/x2 SSDs |
| M2B_SB | 1 x M.2 Socket 3 (type 2280), Chipset integrated: • PCIe 3.0 x2 SSDs |
| SATA | 4 x SATA 6Gb/s connectors (Chipset), support RAID 0, RAID 1, RAID 10 |
USB
| Source | Ports |
|---|---|
| CPU | 4 x USB 3.2 Gen 1 ports (back panel) |
| Chipset | 2 x USB 3.2 Gen 1 ports (via internal header) |
| USB 2.0/1.1 | 6 ports total: 4 x back panel, 2 x via internal header |
Internal I/O Connectors
- 1 x 24-pin ATX main power connector
- 1 x 8-pin ATX 12V power connector
- 1 x CPU fan header
- 1 x system fan header
- 2 x M.2 Socket 3 connectors
- 4 x SATA 6Gb/s connectors
- 1 x front panel header
- 1 x front panel audio header
- 1 x USB 3.2 Gen 1 header
- 1 x USB 2.0/1.1 header
- 1 x Trusted Platform Module (TPM) header (2x6 pin, for GC-TPM2.0_S module only)
- 1 x Clear CMOS jumper
Back Panel Connectors
- 1 x PS/2 keyboard/mouse port
- 1 x DisplayPort
- 1 x HDMI port
- 4 x USB 3.2 Gen 1 ports
- 4 x USB 2.0/1.1 ports
- 1 x RJ-45 LAN port
- 3 x audio jacks
I/O Controller
- iTE I/O Controller Chip
H/W Monitoring
- Voltage detection
- Temperature detection
- Fan speed detection
- Fan fail warning
- Fan speed control
BIOS
- 1 x 128 Mbit flash
- AMI UEFI BIOS (licensed)
- Supports: PnP 1.0a, DMI 2.7, WfM 2.0, SM BIOS 2.7, ACPI 5.0
Unique Features
- APP Center support:
- @BIOS
- EasyTune
- Smart Backup
- System Information Viewer
- Support for Q-Flash
Operating System
- Windows 11 64-bit
- Windows 10 64-bit
Form Factor
| Item | Details |
|---|---|
| Form Factor | Micro ATX |
| Dimensions | 24.4 cm x 24.4 cm |
