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Dark green micro-ATX board with silver heatsinks and black slots

GIGABYTE

GIGABYTE B550M K AM4 AMD motherboard

SKU CH-AVFA-47Y5E

Micro-ATX board for AM4 Ryzen 5000 and 3000 CPUs with four DDR4 slots up to 128 GB, PCIe 4.0 x16, dual M.2, four SATA 6Gb/s, Realtek GbE LAN and USB 3.2 Gen 1

  • ProcessorRyzen 5000 Series
  • ChipsetAMD B550
  • Form factorMicro ATX
  • CPU socketAM4
  • Memory slot count4 × 288pin (DDR4)
  • Supported memoryDDR4 3200
  • Supports Ryzen 5000, 4000 G-Series and 3000 Series CPUs on AM4 socket
  • Dual-channel DDR4 up to 3200 MHz with four slots for 128 GB maximum
  • PCIe 4.0 x16 slot plus M.2 connector for PCIe 4.0 or 3.0 SSDs
  • Realtek GbE LAN delivers 1 Gbps wired networking
  • Q-Flash Plus updates BIOS without CPU, memory or GPU installed

Micro-ATX board for Ryzen 5000 builds

The GIGABYTE B550M K fits the AM4 socket and uses the AMD B550 chipset in a micro-ATX layout. It accepts Ryzen 5000 Series and 3000 Series processors with four DDR4 DIMM slots supporting up to 128 GB in dual-channel mode. A single PCIe 4.0 x16 slot and one M.2 2280 connector wired to the CPU provide the primary expansion path for graphics and fast storage.

4+2 phase digital power with low RDS(on) MOSFETs

The 4+2 phase digital twin power design uses low RDS(on) MOSFETs to deliver stable voltage to supported CPUs. Smart Fan 5 headers allow header-based fan curves so cooling can stay quiet at idle and ramp up under load. No factory acoustics or thermal figures are published for this model.

Q-Flash Plus and RGB Fusion 2.0 included

Q-Flash Plus lets you update the BIOS without installing a CPU, memory or graphics card. RGB Fusion 2.0 software controls addressable and standard RGB strips connected to the onboard headers. The retail package supplies an I/O shield, two SATA cables and M.2 mounting hardware.

How it compares

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

Price $96.99
Cheaper than about 77% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameGIGABYTE
Model nameB550M K
Processor
ProcessorRyzen 5000 Series
CPU socketAM4
ChipsetAMD B550
Memory
Memory slot count4 × 288pin (DDR4)
Supported memoryDDR4 3200
Max supported RAM128 GB
Memory channelsDual Channel
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
Compatibility
Windows 11 supportSupported

Questions about this item

How do I install the M.2 2280 SSD into the M2A_CPU slot and what step do people miss?

Insert the M.2 2280 SSD at an angle into the M2A_CPU slot, secure it with the supplied standoff and screw, then verify in BIOS that the drive appears — many forget to enable the slot or to check the PCIe 4.0 x4 mode matches their Ryzen 5000 Series CPU.

What maintenance or replacement will the board need later?

The CMOS battery will eventually need replacement to keep BIOS settings; the 4+2 phase digital VRM with low RDS(on) MOSFETs and Smart Fan 5 headers should run for years without component swaps if airflow is adequate.

What limit appears first under sustained heavy load?

The 4+2 phase VRM thermal capacity is the first bottleneck during prolonged all-core loads on Ryzen 5000 Series CPUs; adequate case airflow and Smart Fan 5 tuning delay throttling.

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