GIGABYTE B550M K AMD AM4 Micro-ATX Motherboard, Supports Ryzen 5000/4000/3000 Series Processors, DDR4, 3+3 Power Phase, 2X M.2, PCIe 4.0, USB 3.2 Gen 1, GbE LAN, Q-Flash

AMD Socket AM4: Ready to support AMD Ryzen 5000/4000/3000 Series Processors

Processor SocketSocket AM4Memory Clock Speed3200 MHzMemory Storage Capacity128 GBGraphics Card InterfacePCI Express 4.0System Bus Standard SupportedSATA 3Total PCIe Ports2

About this item

  • AMD Socket AM4: Ready to support AMD Ryzen 5000/4000/3000 Series Processors
  • Enhanced Power Solution: Digital 3+3 VRM Design and premium chokes and capacitors for steady power delivery.
  • Advanced Thermal Armor: Chipset heatsinks for better heat dissipation.
  • Boost Your Memory: Compatible with DDR4 and supports 4 DIMMS with Extreme Memory Profile support.
Category: PC PartsMotherboardsRanked #99 of 616 in PC Parts
8.8Our score
Our verdict

AMD Socket AM4: Ready to support AMD Ryzen 5000/4000/3000 Series Processors

Ranked #99 in PC Parts · 4 things we like

Quick answer The GIGABYTE B550M K AMD AM4 Micro-ATX Motherboard scores 8.8/10 with us. Amazon owners rate it 4.4 out of 5 across 1,099 reviews, in line with the 4.3 average of the 147 motherboards we track. It was listed at $74.99 on Amazon when we last checked in September 2026. Key facts: processor socket Socket AM4, memory clock speed 3200 MHz, memory storage capacity 128 GB.

The GIGABYTE B550M K supports AM4 Ryzen 5000 Processors and features unparalleled performance. GIGABYTE B550 motherboards come with upgraded power design, high grade storage standards, and outstanding connectivity that enables you to optimize your performance.

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Product information

24 specifications
Processor SocketSocket AM4
Compatible DevicesPersonal Computer
RAM Memory TechnologyDDR4
Compatible ProcessorsAMD Ryzen 3000 Series, AMD Ryzen 4000 Series, AMD Ryzen 5000 Series
Chipset TypeAMD B550
Memory Clock Speed3200 MHz
PlatformWindows 11
CPU ModelRyzen 5
Memory Storage Capacity128 GB
Ram Memory Maximum Size128 GB
Main Power Connector TypeATX
Graphics Card InterfacePCI Express 4.0
Memory Slots Available4
Number of Ports6
S/PDIF Connector TypeOptical
System Bus Standard SupportedSATA 3
Total SATA Ports4
USB 2.04
Total Usb Ports4
Number of Ethernet Ports1
Total Number of HDMI Ports1
Total PCIe Ports2
Chipset FamilyAMD B550
BrandGIGABYTE

Pros & cons

What we like
  • AMD Socket AM4: Ready to support AMD Ryzen 5000/4000/3000 Series Processors
  • Enhanced Power Solution: Digital 3+3 VRM Design and premium chokes and capacitors for steady power delivery.
  • Advanced Thermal Armor: Chipset heatsinks for better heat dissipation.
  • Boost Your Memory: Compatible with DDR4 and supports 4 DIMMS with Extreme Memory Profile support.
What could be better

    GIGABYTE B550M K AMD AM4 Micro-ATX Motherboard: questions & answers

    Is the GIGABYTE B550M K AMD AM4 Micro-ATX Motherboard worth buying?

    Yes, it is one of the stronger picks in its group. We score the GIGABYTE B550M K AMD AM4 Micro-ATX Motherboard 8.8 out of 10. Amazon owners rate it 4.4 out of 5 across 1,099 reviews, in line with the 4.3 average of the 147 motherboards we track.

    How much does the GIGABYTE B550M K AMD AM4 Micro-ATX Motherboard cost?

    It was listed at $74.99 on Amazon when we last checked in September 2026. That is cheaper than the $183.99 median for motherboards in our catalog. Amazon prices change daily, so use the price button on this page to see the current figure.

    What options does the GIGABYTE B550M K AMD AM4 Micro-ATX Motherboard come in?

    Amazon lists 5 options. Style: B550M|D|M.2 x2|WIFI5|R2, B550M|K|M.2 x2|Non-WIFI, B550|D|M.2 x2|WIFI5. Size: mATX, ATX, mATX (Pack of 10). Pick an option on this page and the button opens exactly that model.

    What are the key specs of the GIGABYTE B550M K AMD AM4 Micro-ATX Motherboard?

    Processor Socket: Socket AM4; Memory Clock Speed: 3200 MHz; Memory Storage Capacity: 128 GB; Graphics Card Interface: PCI Express 4.0; System Bus Standard Supported: SATA 3; Total PCIe Ports: 2. All 24 specifications are in the product information table on this page.

    What are good alternatives to the GIGABYTE B550M K AMD AM4 Micro-ATX Motherboard?

    Similar, well-rated motherboards in our catalog: GIGABYTE B550M Gaming X WIFI6 AMD AM4 mATX (8.8/10, 4.4 stars from 68 owners); ASRock B650M Pro X3D WiFi 6E AMD AM5 Micro-ATX (9.2/10, 4.6 stars from 79 owners); GIGABYTE B650M D3HP AMD AM5 mATX Motherboard (8.6/10, 4.3 stars from 209 owners).

    Customer reviews

    All reviews on Amazon
    4.41,099 global ratings
    5 star78%
    4 star11%
    3 star11%
    2 star0%
    1 star0%

    Breakdown from the 9 most helpful reviews we imported.

    D
    Daniel E Smith
    Verified purchaseJuly 25, 2026
    Great for me, just what I needed for an upgrade

    Works as expected, came packed very well and sealed. Nothing broken or missing. Bios is straight forward not complicated at all. Overall very satisfied, but always do your own research when buying parts for compatibility! Otherwise great purchase!

    J
    Joshua Ward
    Verified purchaseAugust 14, 2026
    My preference for a motherboard with just one SYS_FAN header

    Great motherboard. It has only 1 SYS_FAN header though but overall, it’s exactly what I would prefer on a motherboard to make it easier to setup my fans. Because I’m still missing the CPU and RAM sticks, it doesn’t work for now. Nothing to worry about.

    E
    Eric Nieves
    Verified purchaseAugust 17, 2026
    Ryzen5 5800XT approved!

    Working great with the R7 5800xt out of the box with no bios update needed, just make sure you put the ram sticks in the correct slots😆

    K
    kpad
    Verified purchaseJuly 20, 2026
    GIGABYTE B550M K AMD AM4 Micro-ATX Motherboard

    Its a decent motherboard, but is lacking some things like RGB. It does function as intended and is cheap, so hard to beat.

    J
    Jeff Neel
    Verified purchaseJune 29, 2026
    Solid budget board choice for AM4

    Cheesy-looking board with hardly any features. However, even though it lacks many features, it seems to be a very stable board so far. I am using with a Ryzen 5 5500 and an RTX 4060. Runs games very smoothly. Two nvme slots. The second one is not shared with the pcie slot, like on a lot of boards. So, you can have a card in the second slot as well as an nvme in the second slot. However, the second slot nvme is only gen3. The first slot nvme is 4.0 .. Really, for the price, you can't beat this board. I have bought cheap AsRock boards before and the quality of this is already way better than tho

    J
    Jay F. Grissom
    Verified purchaseJune 29, 2026
    Solid budget board for older AM4 hardware.

    Comes with a legacy PS2 Mouse port? 🤯 Was very supposed to see this port.Slapped a Ryzen 5 into this with 2 8GB DDR 4 3200 Mhz RAM sticks and a bunch of other spare parts I had laying around from upgrading over the years.Some Noctua Fans, an 8GB Power Color 5700 XT Red Dragon (Vulcan Support - not ROCm), an adapter from an older power supply, a new gold rated 650 WATT power supply, a low end small case, and this still games AMAZINGLY well at 1080p!Perfect for SteamOS (all red team parts “just work” out of the box).Over the years I’ve just been quietly upgrading. Had a bunch of extra parts (CP

    J
    Joe Livingstone
    Verified purchaseJuly 24, 2026
    It works, but lacks just about everything other than essential components

    It's OK. Super budget theme board, lacks USB 3, WiFi, etc... I'm not sure if there is even an rgb header for 3pin... If it was $50 I'd buy it again, otherwise I'd pass and look for a board with more features.

    K
    Kosu
    Verified purchaseDecember 3, 2025
    コスパ◎

    特に不具合なく動作しています。価格も安いので、コスパよくパソコンを組みたい方にオススメです。

    Customer reviews are shown as published on Amazon and are not written by Do Best Deal.