GIGABYTE B550M K DDR4 AMD Motherboard
MPN GIGABYTE-B550M-K · Brand Gigabyte · mATX
The Gigabyte B550M K is an AMD AM4 Micro ATX motherboard featuring the B550 chipset, PCIe 4.0 x16 slot, dual M.2 connectors (PCIe 4.0/3.0), four DDR4 DIMM slots supporting up to 128 GB, HDMI 2.1, DisplayPort 1.4, and Smart Fan 5 with FAN STOP — compatible with AMD Ryzen 5000, 4000 G-Series, and 3000 Series processors
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Overview
The Gigabyte B550M K is a Micro ATX motherboard built on the AMD B550 chipset, designed for the AM4 socket. It supports AMD Ryzen 5000 Series, Ryzen 5000 G-Series, Ryzen 4000 G-Series, Ryzen 3000 Series, and Ryzen 3000 G-Series processors, making it a capable platform for a wide range of AMD desktop CPUs. Memory support is handled by four DDR4 DIMM slots capable of accommodating up to 128 GB of system memory using modules with a maximum single-DIMM capacity of 32 GB. The board supports DDR4 speeds from 2133 MHz up to 4733 MHz (via overclocking), operates in dual-channel mode, and is compatible with both ECC and non-ECC unbuffered DIMMs as well as XMP profiles. For storage, the B550M K features two M.2 Socket 3 connectors supporting type 2280 SSDs. The primary M2A_CPU slot (CPU-integrated) supports PCIe 4.0 x4/x2 or SATA modes when paired with Ryzen 5000 Series or 3000 Series processors, while the secondary M2B_SB slot (chipset-integrated) supports PCIe 3.0 x2 SSDs. Additionally, four SATA 6 Gb/s ports with support for RAID 0, RAID 1, and RAID 10 configurations are included. Display output is handled by an integrated AMD Radeon graphics processor via one HDMI 2.1 port (up to 4096x2160 @ 60 Hz, HDCP 2.3, HDR) and one DisplayPort 1.4 output (up to 5120x2880 @ 60 Hz, HDCP 2.3, HDR). These outputs require a compatible APU or G-Series processor. USB connectivity includes four USB 3.2 Gen 1 ports and four USB 2.0/1.1 ports on the rear panel, along with internal headers for two additional USB 3.2 Gen 1 and two USB 2.0 ports. Networking is provided by a Realtek GbE LAN chip supporting 1 Gbps, 100 Mbps, and 10 Mbps speeds, bundled with LAN bandwidth management software. Audio is powered by a Realtek High Definition Audio CODEC supporting 2/4/5.1/7.1-channel output via three rear audio jacks and a front panel audio header, with an isolated audio PCB section (Audio Noise Guard) to reduce interference. Smart Fan 5 technology provides comprehensive thermal management, with multiple temperature sensor points, hybrid fan headers supporting both PWM and voltage-mode fans, and FAN STOP capability allowing fans to cease spinning under low load. Hardware monitoring covers voltage, temperature, and fan speed with fail warnings. The BIOS is a licensed AMI UEFI implementation stored on a 128 Mbit flash chip, compliant with PnP 1.0a, DMI 2.7, WfM 2.0, SM BIOS 2.7, and ACPI 5.0. BIOS utilities include Q-Flash for updates and @BIOS for in-Windows flashing. Additional software includes EasyTune, Smart Backup, System Information Viewer, and Norton Internet Security (OEM). Verifiable Specifications: - Socket: AMD AM4 - Chipset: AMD B550 - Form Factor: Micro ATX, 24.4 cm x 24.4 cm - Memory: 4x DDR4 DIMM, up to 128 GB, DDR4-2133 to DDR4-4733(O.C.), dual-channel, ECC/non-ECC support - PCIe: 1x PCIe 4.0 x16 (CPU), 1x PCIe 3.0 x1 (Chipset) - Storage: 2x M.2 (PCIe 4.0/3.0 + SATA), 4x SATA 6 Gb/s (RAID 0/1/10) - Display: HDMI 2.1 (4K/60Hz), DisplayPort 1.4 (5K/60Hz) - USB Rear: 4x USB 3.2 Gen 1, 4x USB 2.0 - LAN: Realtek GbE (1 Gbps) - Audio: Realtek HD Audio, 7.1-channel - BIOS: AMI UEFI, 128 Mbit flash - OS Support: Windows 11 64-bit, Windows 10 64-bit - Warranty: 3 Years
Datasheet
| Warranty | 3 Years |
|---|---|
| Form Factor | mATX |
| Chipset | AMD B550 |
| CPU Type | |
| Lan | Realtek® GbE LAN chip (1 Gbps/100 Mbps/10 Mbps) |
| USB | CPU:4 x USB 3.2 Gen 1 ports on the back panelChipset:2 x USB 3.2 Gen 1 ports available through the internal USB header6 x USB 2.0/1.1 ports (4 ports on the back panel, 2 ports available through the internal USB header) |
| Bios | 1 x 128 Mbit flashUse of licensed AMI UEFI BIOSPnP 1.0a, DMI 2.7, WfM 2.0, SM BIOS 2.7, ACPI 5.0 |
| Audio | Realtek® Audio CODECHigh Definition Audio2/4/5.1/7.1-channel* You can change the functionality of an audio jack using the audio software. To configure 7.1-channel audio, access the audio software for audio settings |
| Memory | 4 x DDR4 DIMM sockets supporting up to 128 GB (32 GB single DIMM capacity) of system memorySupport 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 modulesDual channel memory architectureSupport for ECC Un-buffered DIMM 1Rx8/2Rx8 memory modules** ECC memory (ECC mode) support varies by CPUSupport for non-ECC Un-buffered DIMM 1Rx8/2Rx8/1Rx16 memory modulesSupport for Extreme Memory Profile (XMP) memory modules(The CPU and memory configuration may affect the supported memory types, data rate (speed), and number of DRAM modules, please refer to "Memory Support List" on GIGABYTE's website for more information.) |
| H/W Monitoring | Voltage detectionTemperature detectionFan speed detectionFan fail warningFan speed control* Whether the fan speed control function is supported will depend on the cooler you install |
| I/O Controller | iTE® I/O Controller Chip |
| Bundle Software | Norton® Internet Security (OEM version)LAN bandwidth management software |
| 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* Actual support may vary by AMD CPU's specification.AMD Ryzen™ 5000 G-Series/4000 G-Series/3000 G-Series Processors support PCIe 3.0 x16 mode1 x PCI Express x1 slot, integrated in the Chipset:Supporting PCIe 3.0 x1 mode |
| Unique Features | Support for APP Center* Available applications in APP Center may vary by motherboard model. Supported functions of each application may also vary depending on motherboard specifications.@BIOSEasyTuneSmart BackupSystem Information ViewerSupport for Q-Flash |
| Onboard Graphics | Integrated Graphics Processor with AMD Radeon™ Graphics support:1 x DisplayPort, supporting a maximum resolution of 5120×2880@60 Hz* Support for DisplayPort 1.4 version, HDCP 2.3, and HDR.1 x HDMI port, supporting a maximum resolution of 4096×2160@60 Hz* Support for HDMI 2.1 version, HDCP 2.3, and HDR.Maximum shared memory of 16 GB |
| Operating System | Support for Windows 11 64-bitSupport for Windows 10 64-bit |
| 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 SSDsAMD Ryzen™ 5000 G-Series/4000 G-Series/3000 G-Series Processors support SATA and PCIe 3.0 x4/x2 SSDs1 x M.2 connector (M2B_SB), integrated in the Chipset, supporting Socket 3, M key, type 2280 SSDs:Supporting PCIe 3.0 x2 SSDs4 x SATA 6Gb/s connectors, integrated in the Chipset:Support for RAID 0, RAID 1, and RAID 10 |
| Back Panel Connectors | 1 x PS/2 keyboard/mouse port1 x DisplayPort1 x HDMI port4 x USB 3.2 Gen 1 ports4 x USB 2.0/1.1 ports1 x RJ-45 port3 x audio jacks |
| Internal I/O Connectors | 1 x 24-pin ATX main power connector1 x 8-pin ATX 12V power connector1 x CPU fan header1 x system fan header2 x M.2 Socket 3 connectors4 x SATA 6Gb/s connectors1 x front panel header1 x front panel audio header1 x USB 3.2 Gen 1 header1 x USB 2.0/1.1 header1 x Trusted Platform Module (TPM) header (2×6 pin, for the GC-TPM2.0_S module only)1 x Clear CMOS jumper |
