Gigabyte B550M K AMD AM4 Motherboard

The Gigabyte B550M K (rev. 1.1) delivers reliable performance for AMD Ryzen builds in a compact Micro-ATX form factor. Designed with Ultra Durable components, this motherboard supports AMD Ryzen 5000 Series, Ryzen 5000 G-Series, Ryzen 4000 G-Series, and Ryzen 3000 Series processors on the AM4 socket.

PCIe 4.0 Performance and Storage

Built for speed, the B550M K features a PCIe 4.0 x16 slot with reduced impedance for high-performance graphics cards. Dual M.2 connectors support NVMe PCIe 4.0/3.0 SSDs, with the M2A_CPU socket delivering up to 64 Gb/s data transfer speeds. The M2B_SB socket provides additional PCIe 3.0 x2 connectivity. Four SATA 6Gb/s ports with RAID 0, 1, and 10 support offer flexible storage configurations.

Memory and Expansion

Four DDR4 DIMM sockets support up to 128GB of system memory with speeds reaching 4733MHz (O.C.) in dual-channel configuration. The motherboard accommodates both ECC and non-ECC unbuffered memory modules with XMP profile support. Expansion options include one PCIe 4.0 x16 slot and one PCIe 3.0 x1 slot for additional components.

Connectivity and Display

Integrated graphics support includes one DisplayPort (5120x2880@60Hz) and one HDMI 2.1 port (4096x2160@60Hz) for multi-display setups. The Realtek GbE LAN chip features bandwidth management for optimized network performance. Rear I/O provides four USB 3.2 Gen 1 ports, four USB 2.0 ports, and internal headers support additional USB 3.2 Gen 1 and USB 2.0 connectivity.

Smart Fan 5 Cooling Control

Smart Fan 5 technology incorporates five temperature sensors and two hybrid fan headers supporting both PWM and voltage mode. The intuitive interface allows complete fan curve customization with Fan Stop capability for silent operation at low temperatures. Hybrid headers automatically detect fan or pump devices for liquid cooling compatibility.

Ultra Durable Design

Gigabyte's Ultra Durable features include solid pin power connectors for stable power delivery, anti-sulfur resistors for longevity, and Glass Fabric PCB technology for humidity protection. High-end audio capacitors with Audio Noise Guard deliver clear sound quality. Enhanced ESD protection and anti-surge ICs safeguard components from electrical irregularities. The patented double locking bracket and low RDS(on) MOSFETs ensure reliable operation under sustained loads.

BIOS and Software

The 128 Mbit AMI UEFI BIOS includes Q-Flash support for easy updates. APP Center provides access to @BIOS, EasyTune, Smart Backup, and System Information Viewer utilities. Windows 11 and Windows 10 64-bit compatibility ensures broad operating system support.

B550M K (rev. 1.1)

Key Features
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
Ultra Durable PCIe 4.0 Ready x16 Slot
Dual Ultra-Fast NVMe PCIe 4.0/3.0 M.2 Connectors
High Quality Audio Capacitors and Audio Noise Guard for Ultimate Audio Quality
GbE LAN with Bandwidth Management
Rear DisplayPort and HDMI for Multi-display Support
Smart Fan 5 Features Multiple Temperature Sensors, Hybrid Fan Headers with FAN STOP
Anti-Sulfur Resistors Design

PERFORMANCE

M.2 PCIe 4.0 Slot
M.2 PCIe 4.0 x4 slot with Lower impedance.

PCIe 4.0 Slot
PCIe 4.0 x16 slot with faster bandwidth and lower impedance.

CONNECTIVITY

Dual NVMe PCIe 4.0/3.0 M.2 Connectors
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 with Bandwidth Management
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.

HDMI 2.1 for 4K / 60P / 21:9 / HDCP 2.3 Support
HDMI 2.1, which is backwards compatible with HDMI 2.0/ 1.4 and offering 48 Gb/s of bandwidth – twice times more than previous generation. This unlocks the potential for users to transfer multiple video streams, as well as a native cinematic 21:9 ratio (which most movies are shot in), Full HDR and HDCP 2.3 support, to offer the best visual experience for viewers.

The Industry's Leading LAN Static-Electricity & Surge Protection
GIGABYTE motherboards use ICs with up to 3 times the ESD resistance levels compared to traditional ICs. This helps to better protect the motherboard and its components against potential damage caused by static electricity. 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 delivery.

COOLING

Smart Fan 5
With Smart Fan 5 users can ensure that their gaming PC can maintain its performance while staying cool. Smart Fan 5 allows users to interchange their fan headers to reflect different thermal sensors at different locations on the motherboard. Not only that, with Smart Fan 5 more hybrid fan headers that support both PWM and Voltage mode fans have been introduced to make the motherboard more liquid cooling friendly.
5 Temperature Sensors
2 Fan Pin Headers
All Fan Pin Headers Upgraded to Hybrid Fan Headers
Interoperable Fans and Sensors
Intuitive UI for Fan Control

FAN STOP
Achieve fan silence. With Fan Stop, map any fan to stop completely when temperatures drop below a specified threshold. Which fan stops, based on readings from which sensor, and at what temperature—all of it can be customized to your liking.

Hybrid Fan Pin Headers
Assume complete control over your liquid cooling setup! Smart Fan 5 receives up-to-the-second information on flow-rate and water-temperature through the Hybrid Fan Pin Headers or external thermistor sensors—giving you absolute mastery over your PC.
All Hybrid Fan Headers can automatically detect the type of cooling device whether it be fan or pump with different PWM or Voltage mode.

New Smart Fan 5 Software
Choose from different modes, Quiet to Full Speed, to match your system usage preferences.
For each fan or pump, you can use the intuitive fan curve to define trigger thresholds and corresponding fan speeds.

AUDIO

High-End Audio Capacitors
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.

Audio Noise Guard
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.

ULTRA DURABLE

GIGABYTE Patented Double Locking Bracket
Double locking bracket

First Lock
Inserted from the top for better retention

Second Lock
Soldered for a stronger bond

Solid Pin Power Connectors
B550 motherboards feature solid plated ATX 12V 8pin power connectors for offering stable power supply while CPU overloading.

Solid Pin Power connector advantages
Larger contact area for electricity
More metal quantity to sustain higher power and generated heat
Ultra durable and longer lifespan

START SULFURIZATION PROTECTION
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.

The Industry's Leading Surge Protection
GIGABYTE motherboards also feature special anti-surge IC that protect your motherboard, helping to ensure that your PC is equipped to deal with any potentially irregular electrical spikes.

Humidity Protection Glass Fabric PCB
There is nothing more harmful to the longevity of your PC than moisture, and most parts of the world experience moisture in the air as humidity at some point during the year. GIGABYTE motherboards have been designed to make sure that humidity is never an issue, incorporating a new Glass Fabric PCB technology that repels moisture caused by humid and damp conditions. Glass Fabric PCB technology uses a new PCB material which reduces the amount of space between the fiber weave, making it much more difficult for moisture to penetrate compared to traditional motherboard PCBs. This offers much better protection from short circuit and system malfunction caused by humid and damp conditions.

High Temperature Protection Lower RDS(on) MOSFETs Design
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.

Specification

CPU
AMD Socket AM4, support for: AMD Ryzen 5000 Series/ Ryzen 5000 G-Series/ Ryzen 4000 G-Series and Ryzen 3000 and Ryzen 3000 G-Series Processors

Chipset
AMD B550

Memory
4 x DDR4 DIMM sockets supporting up to 128 GB (32 GB single DIMM capacity) of system memory
Support for 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 memory modules
Dual channel memory architecture
Support for ECC Un-buffered DIMM 1Rx8/2Rx8 memory modules
Support for non-ECC Un-buffered DIMM 1Rx8/2Rx8/1Rx16 memory modules
Support for Extreme Memory Profile (XMP) memory modules

Onboard Graphics
Integrated Graphics Processor with AMD Radeon Graphics support:
1 x DisplayPort, supporting a maximum resolution of 5120x2880@60 Hz
1 x HDMI port, supporting a maximum resolution of 4096x2160@60 Hz

Audio
Realtek Audio CODEC
High Definition Audio
2/4/5.1/7.1-channel

LAN
Realtek GbE LAN chip (1 Gbps/100 Mbps/10 Mbps)

Expansion Slots
1 x PCI Express x16 slot, integrated in the CPU:
AMD Ryzen 5000 Series/3000 Series Processors support PCIe 4.0 x16 mode
AMD Ryzen 5000 G-Series/4000 G-Series/3000 G-Series Processors support PCIe 3.0 x16 mode
1 x PCI Express x1 slot, integrated in the Chipset:
Supporting PCIe 3.0 x1 mode

Storage Interface
1 x M.2 connector (M2A_CPU), integrated in the CPU, supporting Socket 3, M key, type 2280 SSDs:
AMD Ryzen 5000 Series/3000 Series Processors support SATA and PCIe 4.0 x4/x2 SSDs
AMD Ryzen 5000 G-Series/4000 G-Series/3000 G-Series Processors support SATA and PCIe 3.0 x4/x2 SSDs
1 x M.2 connector (M2B_SB), integrated in the Chipset, supporting Socket 3, M key, type 2280 SSDs:
Supporting PCIe 3.0 x2 SSDs
4 x SATA 6Gb/s connectors, integrated in the Chipset:
Support for RAID 0, RAID 1, and RAID 10

USB
CPU:
4 x USB 3.2 Gen 1 ports on the back panel
Chipset:
2 x USB 3.2 Gen 1 ports available through the internal USB header
6 x USB 2.0/1.1 ports (4 ports on the back panel, 2 ports available through the internal USB 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 the 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 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
Use of licensed AMI UEFI BIOS
PnP 1.0a, DMI 2.7, WfM 2.0, SM BIOS 2.7, ACPI 5.0

Unique Features
Support for APP Center
@BIOS
EasyTune
Smart Backup
System Information Viewer
Support for Q-Flash

Operating System
Support for Windows 11 64-bit
Support for Windows 10 64-bit

Form Factor
Micro ATX Form Factor; 24.4cm x 24.4cm

• Socket: AM4
• CPU Compatibility: AMD Ryzen
• Chipset: AMD B550
• Form Factor: Micro ATX
• Memory Slots: DDR4 - 4 Slots
• M.2 Compatibility:
• USB C: No