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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

  • ProcessorRyzen 3000 Series / Ryzen 4000G Series / Ryzen 5000 Series /
  • ChipsetAMD B550
  • Form factorMicro ATX
  • CPU socketAM4
  • Memory slot count4 × 288pin (DDR4)
  • Supported memoryDDR4 3200

Model B550M K

  • 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.

How it compares

Measured against everything we stock in Motherboards for AMD CPUs, at today’s prices. Recalculated every night.

Price $70.99
Cheaper than about 85% of the 1,906 comparable items (median $224.49).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameGIGABYTE
Model nameB550M K
Processor
ProcessorRyzen 3000 Series / Ryzen 4000G Series / Ryzen 5000 Series / Ryzen 5000G Series
CPU socketAM4
ChipsetAMD B550
Memory
Memory slot count4 × 288pin (DDR4)
Supported memoryDDR4 3200
Max supported RAM128 GB
Memory channelsDual Channel
Memory profilesIntel XMP 2.0
ECC supportSupport 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
BufferingUn-buffered
Storage
SATA ports4 x SATA 6Gb/s
M.2 slots1 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
Connectivity
Ethernet controllerRealtek GbE LAN chip
Maximum network speed1 Gbit/s
Ports & slots
PCIe 4.0 x16 slots1 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
PCIe x1 slots1 x PCI Express x1 slot, integrated in the Chipset:
Supporting PCIe 3.0 x1 mode
Rear panel 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 USB headers1 x USB 3.2 Gen 1 header
1 x USB 2.0/1.1 header
Power
Power connectors1 × 24-pin ATX main power connector
1 × 8-pin ATX 12 V power connector
Size & build
Form factorMicro ATX
Width and length9.6 in × 9.6 in
Shipping weight0.98 kg
Package size267 × 265 × 57 mm
Compatibility
Windows 11 supportSupported

Other versions of this model

4 more in the same range

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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