Best Mini-ITX B550 Motherboards

The Small Form Factor B550 mobos are ready to roll; not too many options but this mini dimension board still packed with some modern features. As the B550 chipset launches, you may expect the PCIe 4.0 implementation for NVMe storage and Graphics Card, including a more reliable networking solution in just Mini-ITX board.

Suppose you’re going to build a smaller but powerful PC gaming or an HTPC based on Ryzen chips this year. The B550 Mini ITX (M-ITX) motherboard could be your new favorite, and it accomplished much better VRM overall and some latest features added compared to the earlier B450 Mini ITX motherboard.

But again, in general, mini dimensions always held a lot of constraints on a small 6.7″ x 6.7″ board; it’s not easy for the motherboard manufacturer’s to design the best layout for an SFF motherboard. As for the features, the SSF lover or first-time builder should know that limitation; typically, even they have to sacrifice some standard features.

Should you really get the B550 M-ITX motherboard instead of the cheaper B450 or the highest X570 chipset?

The SSF builder realizes that a single graphic card, not more than 2 SSD, or HDD is just fine for a compact build PC. Therefore, B550 chipset available PCIe lanes should be adequate, besides for the freshest series of AMD’s motherboard, B550 chipset comes with some latest features that still carry on the mini motherboard.

Mini-ITX B450 motherboard could be a still best budget option for budget processors, but, it recommends only up to Ryzen 7 3700XT series due to VRM limitation. Thus, the B550 motherboard is the most sensible and safest choice for Ryzen 7 3700XT or higher including if you are going upgrade to Ryzen 4000 series later.

Performance-wise, the best B550 ITX motherboards are as good as middle-class B550 ATX motherboards, It should be comfortable to handle mid-class Ryzen for overclocking (i.e., Ryzen 7 3700XT), or even higher-end Ryzen 9 3950X will run fine as long as not for overclocking.

Basically, it’s a huge upgrade from B450 in almost all aspects, even the latest features added, 2.5 LAN, and also the new wireless module while the high-end X570 motherboard is still utilizing the older one. It just the initial price tag that might give a poor first impression of the reviewer or enthusiast.

B550 and X570 mini-ITX mobos are almost at the same level of VRM implementation and build quality, B550 has a higher memory frequency and some latest networking technology on it, but the X570 chipset is always supported more extra connectivity on the I/O.

So, if you’re going to build powerful HTPC or second Rig this year, the B550 chipset motherboard still can be the right choice as long as you really know what you need.

Best Mini-ITX B550 Motherboards Comparison Table

Gigabyte B550i Pro AXASUS ROG Strix B550-I GamingASRock B550 Phantom Gaming-ITX/AXMSI MPG B550I Gaming EdgeASRock B550M-ITX/AC
ChipsetAMD B550

AMD B550

AMD B550

AMD B550

AMD B550

Form FactorM-ITX (6.7 x 6.7 inch)M-ITX (6.7 x 6.7 inch)M-ITX (6.7 x 6.7 inch)M-ITX (6.7 x 6.7 inch)M-ITX (6.7 x 6.7 inch)
VRM6+2 Renesas ISL99390 90A8+2 Vishay SiC639 50A6+2 Renesas ISL99390 90A8+2+1 MP86936 60A6+2 Vishay SiC654 50A
Storage4x SATA 6Gb/s ports + 2x M.2 slots4x SATA 6Gb/s ports + 2x M.2 slots4x SATA 6Gb/s ports + 2x M.2 slots4x SATA 6Gb/s ports + 2x M.2 slots4x SATA 6Gb/s ports + 1x M.2 slots
USB 3.2 Gen 2 (10 and 20 Gb/s)2x (Type-C front panel connector + Type-A back panel)4x (1x Type-C + 3 x Type-A back panel) and 1x front panel connector Type-C2x (1x Type-C + 1 x Type-A back panel) and 1x front panel connector Type-C2x (1x Type-C + 1 x Type-A back panel)
USB 3.2 Gen 1 (5 Gb/s)6x (4 Type-A back panel + 2 front)2x front panel connector6x (4 Type-A back panel + 2 front)5x (4 Type-A back panel + 1 Type-C front)6x (2 Front, 3 Rear Type-A, 1 Rear Type-C)
BIOSQ-Flash PlusBIOS Flashback ButtonBIOS Flashback Button
Memory DDR42x DDR4 64GB (up to 4866+ O.C.)2x DDR4 64GB (up to 5100+ O.C.)2x DDR4 64GB (up to 5400+ O.C.)2x DDR4 64GB (up to 4600+ O.C.)2x DDR4 64GB (up to 4733+ O.C.)
PCI-E1x PCIe 4.0 Slot1x PCIe 4.0 Slot1x PCIe 4.0 Slot1x PCIe 4.0 Slot1x PCIe 4.0 Slot
AudioRealtek ALC1220-VB SupremeFX S1220ARealtek ALC1220Realtek ALC1200Realtek ALC887
LANRealtek 2.5GbE LAN Intel I225-V 2.5GbE LANIntel I225-V 2.5GbE LANRealtek 2.5GbE LANRealtek 1GbE LAN
WiFiIntel Wi-Fi 6 AX200Intel Wi-Fi 6 AX200Intel Wi-Fi 6 AX200Intel Wi-Fi 6 AX200Intel 802.11ac
Fan Headers3 Hybrid3 Hybrid + 1 VRM3 Hybrid3 Hybrid3 Hybrid
Video OutputDisplayPort 1.4 (5120×2880@60 Hz) + 2x HDMI 2.1 (4096×2160@60 Hz)DisplayPort 1.4 + HDMI 2.1 (4096×2160@60 Hz)DisplayPort 1.4 (5120×2880@60 Hz) + HDMI 2.1 (4096×2160@60 Hz)HDMI 2.1 (4096×2160@60 Hz)DisplayPort 1.4 (5120×2880@60 Hz) + HDMI 2.1 (4096×2160@60 Hz)
RGB Connector1 x addressable LED strip header
1 x RGB LED strip header
1 x addressable LED strip header
1 x RGB LED strip header
1 x addressable LED strip header
1 x RGB LED strip header
1x 3-pin RAINBOW LED connector1 x addressable LED strip header
1 x RGB LED strip header
Thunderbolt header
Optical S/PDIF OUT1
Unique FeaturesFlexkey, USB Audio Chip

So, Here Are The best B550 Mini-ITX Motherboards That Might Fit For You

1. Gigabyte B550i Pro AX – Editor’s Choice : The best value B550 M-ITX motherboard

Best Value Choice for Small but Powerful PC.


  • Excellent power delivery.
  • Great layout.
  • Aesthetic mini ITX looking.
  • 4 SATA slots and dual M.2.
  • Realtek 2.5GbE LAN + Intel Wi-Fi 6 AX200.
  • More reasonable price tag than competitors.
  • Feature-rich M-ITX board.
  • Great audio solution.
  • Q-Flash Plus.


  • Missing USB Type-C header.

Gigabyte B550i Pro AX applies a decent VRM implementation, 6+2 Phases with 90A of Power Stages with extended heatsink plus Heatpipe, 8 layers of PCB, 3 fan headers, and 5 temperature sensors and Fan Stop support. Provide enough power delivery for Ryzen 3900XT or 3950X without overclocking. 

It’s not a shiny looking board, but it’s a neutral color and feels robust throughout. Utilizing a large VRM heatsink, aluminum backplate, an integrated I/O shield, and armored memory DIMM and PCIe slots. Appealing RGB implementation with tons of LED customizations plus an additional 1x addressable LED strip header, and 1x RGB LED strip header.

Gigabyte B550I AORUS Pro AX also comes with some modern features, including Realtek 2.5 Gb/s LAN, and even Intel WiFi 6 802.11ax plus Bluetooth 5 Module for the networking solution. A total of 6 USB on the rear panel should be enough, including one USB 3.2 Gen 2 Type-A and Type-C, but the biggest disappointment is this board doesn’t offer front panel Type-C connector.

For the audio section, Gigabyte executes the latest Realtek High-End HD Audio Codec ALC1220-VB Immersive Gaming ViBes, which is excellent for HTPC and gaming experience. And the storage solution, the board supports 4 SATA ports and dual M.2 drives fully backed by the heatsink, but only one NVMe drive supports PCIe Gen 4. Also, one PCIe X16 Gen 4 slot is just common for M-ITX, you are not missing more available Lanes of X570 chipset.

This board support tripe monitor at the same time through:

  • 2x HDMI 2.1 (4K @60Hz), (*HDCP 2.3, and HDR.)
  • DisplayPort 1.4 (5K @60Hz).

The Gigabyte B550I AORUS Pro AX is an attractive value option for Mini-ITX motherboard that can handle any high-end Ryzen chips polished with a bunch of new features. I surely recommend this mobo for a small but powerful rig as long as you do not need the front panel Type C connector.

2. ASUS ROG Strix B550-I Gaming – The best premium gaming touch B550 M-ITX motherboard

Play Your Own Style.


  • Still great power delivery and comprehensive cooling system.
  • Great layout.
  • Aesthetic futuristic.
  • 4 SATA slots and dual M.2.
  • Intel I225-V 2.5GbE LAN + Intel Wi-Fi 6 AX200.
  • ASUS Q-LED Debug.
  • More unique ROG features.
  • SupremeFX S1220A + USB sound chip.
  • BIOS Flashback Button.
  • USB Type-C header 10Gbps.


  • Pricey.
  • An active VRM cooling system.

ROG Strix B550-I Gaming comes with reliable power delivery 8+2 phase 50A of the power stages, with massive VRM heatsink, comprehensive cooling system, and an active VRM cooling; the result is this board is capable of handling the top-end Ryzen 3000XT series.

Aesthetically gaming mini-ITX board with cybertext patterning and brand-new designs ROG Strix looks like becoming a more premium choice than the competitors, it’s should be great for ROG lovers.

ROG Strix B550-I Gaming AX also comes Intel 2.5 Gb/s LAN, and Intel WiFi 6 AX200 plus Bluetooth 5 Module for the networking solution. A total of 6 USB on the back panel, with 4x USB 3.2 Gen 2 ports (3x Type-A + 1x USB Type-C) and 2x USB 2.0 Ports, one of its can be switched into audio USB Type-C. Also, this board support 1x USB 3.2 Gen2 Type-C for the front-panel option.

SupremeFX S1220A CODEC Dual OP amplifiers, including Sonic Studio III, will handle the audio section, which should be one of the most advanced integrated sound implementations until now. An Audio USB Type-C port has an S210 built-in chip on it, and still, this board bundled with a USB TypeC-to-3.5 mm adapter. The board carries 4 SATA ports and dual M.2 drives with Heatsink and 1x PCIe X16 Gen 4 slot.

This board supports dual monitor at the same time through:

  • HDMI 2.1 (4K @60Hz), (*HDCP 2.3, and HDR.)
  • DisplayPort 1.4

Overall, ROG Strix B550-I Gaming is a well-made motherboard designed for ROG enthusiasts, a premium mini-ITX motherboard with unique features and software that comes with a premium price too.

3. ASRock B550 Phantom Gaming-ITX/AX – An alternative choice for the best value feature-set M-ITX B550 motherboard for gaming

Designed by gamers and for gamers!


  • Excellent power delivery.
  • Great layout.
  • 4 SATA slots and dual M.2.
  • Intel I225-V 2.5GbE LAN + Intel Wi-Fi 6 AX200.
  • Realtek 1220 Audio Codec.
  • USB Type-C header 10Gbps.
  • Feature-rich M-ITX board.
  • Much more affordable than ASUS ROG.


  • Right-angled SATA port might cause issue.

The ASRock B550 Phantom Gaming-ITX/AX also offers effective power delivery performance for any high-end Ryzen processor. 8 layer of PCB, 6+2 phase VRM ISL99390 90A, passive VRM heatsink cooling manages very well with temperature.

Also comes with the most advanced Intel WiFi 6 AX200 + Bluetooth 5.1 for the wireless solution and Intel I225-V 2.5GbE LAN wired networking. For the storage, 4 SATA 6Gbps right-angle ports and dual M.2 NVMe SSD that backed with a heatsink.

Support front panel USB 3.2 Gen2 Type-C header and A total of 6 USB on the rear panel should be sufficient, including one USB 3.2 Gen2 Rear Type-A and Type-C. And the PCIe 4.0 16x slot on a single slot. For the audio solution, ASRock implements ALC1220 and Nahimic software, intensify in a great movie or gaming experience.

This board support dual monitor through:

  • HDMI 2.1 (4K @60Hz), (*HDCP 2.3, and HDR.)
  • DisplayPort 1.4 (5K @60Hz).

Overall, the ASRock B550 Phantom Gaming-ITX/AX is a very compelling MITX motherboard to run Ryzen 9 3950X CPU flawlessly. Phantom Gaming is an excellent option for looking for a complete package from small form factor build, including USB 3.2 Gen2 Type-C header. It just on some cases, the right-angled SATA port configuration might give you pain by blocking the next port or depending on what PC cases; however, if only using one SATA or not using it at all, it should not be a problem.

4. MSI MPG B550I Gaming Edge – The best B550 M-ITX for home theater (SPDIF)

Well made mini board but non-standard backplate.


  • Excellent power delivery.
  • 4 SATA slots and dual M.2.
  • Realtek 2.5GbE LAN + Intel Wi-Fi 6 AX200.
  • USB Type-C header 5Gbps.
  • EZ Debug LED.
  • Optical output option. (SPDIF)


  • Inferior Realtek ALC1200.
  • Design problem at the backplate.

MSI MPG B550I Gaming Edge using 8+2+1 phase MP86936 60A that also great for handling the highest Ryzen series. There’s no active cooling on the VRM, but on the M.2 NVMe drive, you can manually turn it off as long as it is a safe temperature.

Black and grey colors easy to match with the system but missing integrated RGB LEDs might be a consideration for someone. While the additional audio I/O at the rear panel is sweet, too bad, it uses the slightly inferior Realtek ALC1200 onboard audio compared to other competitors that use the more latest Realtek ALC1220 Codec.

For the connectivity, there are 6 USB ports on the rear panel, including 2x USB 3.2 Gen2 (1 Type-C port and 1 Type-A port) and 2x USB 3.2 Gen1. Front-panel USB Type-C support is USB 3.2 Gen1 that is up to 5 Gbps, not the fastest one.

This board only support one monitor at the same time through:

  • HDMI 2.1 (4K @60Hz), (*HDCP 2.3, and HDR.)

I would recommend this board if only you are utilizing SPDIF to connect the computer to a Home Theater. Otherwise, a design flaw with particular sticking backplate chipset implementation might give you another problem, which makes it incompatible with some coolers that require Backplate to be replaced.

5. ASRock B550M-ITX/AC – The cheapest B550 M-ITX option

The cheapest one.


  • Fair power delivery.
  • 4 SATA slots.
  • Cheapest one.


  • Realtek 1GbE LAN + Intel 802.11ac
  • Only one M.2 slot.
  • Mediocre audio solution.
  • No USB-C header

The cheapest M-ITX B550 option, the 6+2 phases 50A VRM implementation, is mediocre but still better than the common B450 M-ITX. This board works just excellent for Ryzen 3700XT at the stock clock, I don’t recommend this for the high-end Ryzen series.

It’s cheapest M-ITX B550 so far, so dropping the latest WiFi 6 technology and 2.5GbE LAN, only one M.2 available on this board, no USB-C header, and also you get the very inferior audio codec.

This board support dual monitor through:

  • HDMI 2.1 (4K @60Hz), (*HDCP 2.3, and HDR.)
  • DisplayPort 1.4 (5K @60Hz).

If you need cheapest B550 Mini-ITX that can handle mid-class Ryzen series well, need to try PCIe 4.0 on the single GPU and M.2 NVMe without demanding any additional modern feature-set, this board is probably for you.

Wrapping up the best Mini ITX B550 motherboard for Ryzen 3000 series

If you looking for the best value Mini ITX B550 in overallGigabyte B550i Pro AXCheck Price On Amazon
For the extravagant M-ITX B550ASUS ROG Strix B550-I GamingCheck Price On Amazon
An alternative choice for the best value mini-ITX B550ASRock B550 Phantom Gaming-ITX/AXCheck Price On Amazon
For home theater (SPDIF)MSI MPG B550I Gaming EdgeCheck Price On Amazon
The cheapest solutionASRock B550M-ITX/ACCheck Price On Amazon

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