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Micro-ATX motherboard in dark PCB with silver heatsinks and four RAM slots

GIGABYTE

GIGABYTE B550M K AMD motherboard

SKU CH-KBGR-6STD7 MPN B550M K

Micro-ATX AM4 board with dual M.2 slots, PCIe 4.0 x16, four DDR4 slots up to 128 GB and Realtek GbE LAN

  • CPU Socket TypeAM4
  • CPU TypeRyzen 3000 Series / Ryzen 4000G Series / Ryzen 5000 Series /
  • ChipsetAMD B550
  • Number of Memory Slots4x288pin (DDR4)
  • Memory StandardDDR4 3200
  • Maximum Memory Supported128GB

Option B550M K

Struck-through versions exist but are not stocked here.

  • Supports Ryzen 3000, 4000G, 5000 and 5000G processors on AM4 socket
  • Four DDR4 slots accept up to 128 GB at 3200 MHz with XMP 2.0
  • PCIe 4.0 x16 graphics slot and dual M.2 connectors for fast NVMe storage
  • Realtek GbE LAN delivers 1 Gbps wired networking
  • Smart Fan 5 and Q-Flash Plus simplify cooling control and BIOS updates

AMD B550 Micro-ATX for Ryzen 3000/5000

This GIGABYTE B550M K motherboard uses the AMD B550 chipset on a Micro-ATX form factor. It accepts AMD Ryzen 3000 Series, 4000G Series, 5000 Series and 5000G Series processors in the AM4 socket. Four DDR4 slots support up to 128GB of dual-channel memory at 3200MHz with XMP 2.0 profiles.

Check CPU generation for PCIe 4.0 and M.2 speed

The primary PCIe 4.0 x16 slot and the CPU-linked M.2 connector run at PCIe 4.0 only with Ryzen 3000 or 5000 Series CPUs. Ryzen 4000G and 5000G Series processors limit these to PCIe 3.0. Verify your processor choice matches the storage and graphics bandwidth you need.

4+2 digital power phases and dual M.2 slots

A 4+2 phase digital twin power design with low RDS(on) MOSFETs feeds the CPU. Two M.2 slots accept 2280 SSDs; one connects to the CPU, the other to the chipset. Realtek GbE LAN provides 1Gbps networking. RGB Fusion 2.0 headers drive addressable and standard LED strips. Q-Flash Plus updates the BIOS without a CPU installed.

Highlights

  • Supports Ryzen 3000, 4000G, 5000 and 5000G processors on AM4 socket
  • Four DDR4 slots accept up to 128 GB at 3200 MHz with XMP 2.0
  • PCIe 4.0 x16 graphics slot and dual M.2 connectors for fast NVMe storage
  • Realtek GbE LAN delivers 1 Gbps wired networking
  • Smart Fan 5 and Q-Flash Plus simplify cooling control and BIOS updates

Specifications

BrandGIGABYTE
ModelB550M K
CPU Socket TypeAM4
CPU TypeRyzen 3000 Series / Ryzen 4000G Series / Ryzen 5000 Series / Ryzen 5000G Series
ChipsetAMD B550
Number of Memory Slots4x288pin (DDR4)
Memory StandardDDR4 3200
Maximum Memory Supported128GB
Channel SupportedDual Channel
Memory Performance ProfileIntel XMP 2.0
ECC SupportedSupport for ECC Un-buffered DIMM 1Rx8/2Rx8 memory modules*
* ECC memory (ECC mode) support varies by CPU
Support for non-ECC Un-buffered DIMM 1Rx8/2Rx8/1Rx16 memory modules
Buffer SupportedUn-buffered
Memory FeatureSupport for Extreme Memory Profile (XMP) memory modules
PCI Express 4.0 x161 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 Processors support PCIe 3.0 x16 mode
PCI Express x11 x PCI Express x1 slot, integrated in the Chipset:
Supporting PCIe 3.0 x1 mode
Serial ATA (SATA)4 x SATA 6Gb/s
M.21 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 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
Audio ChannelsRealtek Audio CODEC
High Definition Audio
2/4/5.1/7.1-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.
LAN ChipsetRealtek GbE LAN chip
Max LAN Speed1Gbps
Back I/O Ports1 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
Onboard USB1 x USB 3.2 Gen 1 header
1 x USB 2.0/1.1 header
Other Connectors1 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 Trusted Platform Module (TPM) header (2x6 pin, for the GC-TPM2.0_S module only)
1 x Clear CMOS jumper
Form FactorMicro ATX
Dimensions (W x L)9.6" x 9.6"
Power Pin1 x 24-pin ATX main power connector
1 x 8-pin ATX 12V power connector
Windows 11Supported
FeaturesSupport 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.
@BIOS
EasyTune
Smart Backup
System Information Viewer
Support for Q-Flash
Support for Xpress Install
Shipping weight0.98 kg
Package size267 × 265 × 57 mm

Other versions of this model

4 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

What comes in the box and what must I buy separately?

The board includes the motherboard, I/O shield, SATA cables and driver disc. You must supply an AM4 Ryzen 3000/4000G/5000/5000G CPU, DDR4 DIMMs, storage drives and a graphics card if the processor lacks integrated graphics.

Which M.2 slot should I choose for a 2280 PCIe 4.0 SSD?

Use the M2A_CPU slot wired to the CPU; with a Ryzen 5000 or 3000 series chip it runs at PCIe 4.0 x4, while 4000G/5000G series CPUs limit it to PCIe 3.0 x4.

What does the PCIe 4.0 x16 label mean once a graphics card is installed?

With a Ryzen 5000 or 3000 series processor the primary x16 slot operates at PCIe 4.0 x16; with a 4000G or 5000G series APU it drops to PCIe 3.0 x16.

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