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ASRock B550 Phantom Gaming ITX AX Review | 107 Data compared

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  • Avg. price in UK: ~£170
  • Avg. price in US: ~$170
  • CPU socket: AM4
  • Chipset: AMD B550
  • Form factor: Mini-ITX

ASRock B550 Phantom Gaming ITX AX review. Compare 107 technical specifications and user reviews to see how it ranks among motherboards and if it is worth buying.

6.3

Overall score

What it is: An overall evaluation of the motherboard's quality, based on technical analyses and user reviews.

When it matters: When you need a quick reference to identify the best motherboards on the market.

Score components:

90.0%

6.0

Technical Score

10.0%

9.0

User score

Good
6.0

Technical Score

What it is: An assessment of the motherboard's technical performance, covering key areas such as power delivery, CPU and memory support, expansion, storage, connectivity, cooling, BIOS features, and design.

When it matters: When you want to compare motherboards based on technical performance and available features.

Score components:

19.0%

4.4

Memory

16.0%

7.7

Platform & Features

16.0%

6.1

Storage

15.0%

9.2

Network

13.0%

3.3

Ports & USB

8.0%

3.6

Expansion

8.0%

5.6

Power & Cooling

5.0%

8.8

Audio

Good
9.0

User score

What it is: A rating that combines user reviews and the total number of reviews received by the motherboard.

When it matters: When you want to understand how a motherboard performs in real-world builds and how reliable it is in terms of stability, BIOS usability, connectivity, and long-term ownership.

Score components:

70.0%

8.6

User reviews

30.0%

9.9

Popularity

User score:
United Kingdom
amazon
4.2
(385)
United States
Amazon_logo.png
4.3
(391)

(Reviews last updated: May 2026)

Exceptional
  • 5.7
    Gaming

    Score components:

    28.0%

    5.2

    VRM phases

    22.0%

    5.5

    N. of M.2 sockets

    18.0%

    10

    LAN speed

    17.0%

    6.3

    Maximum RAM speed

    15.0%

    1.0

    N. of PCIe 5.0 x16 slots

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Best prices in UK

Best rankings

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Available: ranking among products currently available (including other versions of this product).
All: ranking among all products in the database.

Verdict

The ASRock B550 Phantom Gaming-ITX/ax is a high-performance Mini-ITX motherboard featuring an 8-phase 90A Dr.MOS power design and an 8-layer PCB, supporting AMD AM4 Ryzen processors and DDR4 memory up to 5400+MHz (OC). Key specifications include a PCIe 4.0 x16 slot, dual M.2 slots (one Hyper Gen4x4 and one Ultra Gen3x4), 2.5G Intel LAN, and Wi-Fi 6 (802.11ax) for advanced connectivity. Its main pros are the robust power delivery for stable overclocking, a fanless VRM cooling solution, and premium features like Realtek ALC1220 7.1 audio and a front-panel USB 3.2 Gen2 Type-C header. However, notable cons include the lack of a rear BIOS Flashback or Clear CMOS button, and right-angled SATA ports that may cause clearance issues in some compact SFF cases.

Technical Specifications of ASRock B550 Phantom Gaming ITX AX

Technical Score

What it is: An assessment of the motherboard's technical performance, covering key areas such as power delivery, CPU and memory support, expansion, storage, connectivity, cooling, BIOS features, and design.

When it matters: When you want to compare motherboards based on technical performance and available features.

Score components:

19.0%

4.4

Memory

16.0%

7.7

Platform & Features

16.0%

6.1

Storage

15.0%

9.2

Network

13.0%

3.3

Ports & USB

8.0%

3.6

Expansion

8.0%

5.6

Power & Cooling

5.0%

8.8

Audio

6.0
ASRock B550 Phantom Gaming ITX AX has a technical score of 6.03 points, which is lower than that of 56.7% of products in this category.
User score

What it is: A rating that combines user reviews and the total number of reviews received by the motherboard.

When it matters: When you want to understand how a motherboard performs in real-world builds and how reliable it is in terms of stability, BIOS usability, connectivity, and long-term ownership.

Score components:

70.0%

8.6

User reviews

30.0%

9.9

Popularity

User score:
United Kingdom
amazon
4.2
(385)
United States
Amazon_logo.png
4.3
(391)

(Reviews last updated: May 2026)

9.0
ASRock B550 Phantom Gaming ITX AX has a user score of 8.99 points, which is higher than that of 81.4% of products in this category.
Popularity
What it is: An indicator based on the number of reviews received by the motherboard.
When it matters: When you prefer a motherboard that has already been bought and reviewed by many other users.
9.9
ASRock B550 Phantom Gaming ITX AX has a popularity of 9.9 points, which is higher than 79.7% of products in this category.
Ratio quality/price

What it is: An indicator that combines the motherboard's overall rating with its cost.

When it matters: When you are looking for a motherboard that offers a strong balance of features, performance, and price.

Score components:

60.0%

6.3

Overall score

40.0%

9.6

Price

7.3
ASRock B550 Phantom Gaming ITX AX has a quality-to-price ratio of 7.3 points, which is higher than 46.1% of products in this category.
Brand name
What it is: The brand that makes the motherboard.
When it matters: When you have a brand preference for support, BIOS, or build quality.

Importance: MEDIUM

Asrock
CPU socket
What it is: The socket type the motherboard is built to support.
When it matters: When you need the motherboard to match a specific CPU.

Importance: HIGH

AM4
ASRock B550 Phantom Gaming ITX AX uses the AM4 CPU socket, which is more advanced than that of 38.5% of motherboards and equal to that of 13.3% of motherboards.
CPU platform

Importance: MEDIUM

AMD
Chipset
What it is: The chipset that defines the motherboard platform and many of its features.
When it matters: When you compare platform features, connectivity, and CPU support.

Importance: HIGH

AMD B550
ASRock B550 Phantom Gaming ITX AX uses the AMD B550 chipset, which is more advanced than that of 50.5% of motherboards and equal to that of 4.4% of motherboards.
Form factor
What it is: The physical size standard of the motherboard, such as ATX or Micro-ATX.
When it matters: When you need the board to fit a specific case size.

Importance: HIGH

Mini-ITX
ASRock B550 Phantom Gaming ITX AX has the Mini-ITX form factor, which is less versatile than that of 84.6% of motherboards and equal to that of 7.3% of motherboards.
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DDR memory version
What it is: The RAM generation the motherboard supports, such as DDR4 or DDR5.
When it matters: When you need the board to match a certain memory platform.

Importance: HIGH

Good value: DDR5

DDR4
ASRock B550 Phantom Gaming ITX AX uses DDR4 memory, which is newer than that of 13.6% of motherboards and equal to that of 51% of motherboards.
Memory slots
What it is: The number of RAM slots on the motherboard.
When it matters: When you want more room for future memory upgrades.

Importance: HIGH

Good value: >=4

2
ASRock B550 Phantom Gaming ITX AX has 2 Memory slots, which is fewer than 78.6% of motherboards and equal to 21.4% of motherboards.
Maximum memory capacity
What it is: The largest total amount of RAM the motherboard supports.
When it matters: When you plan a build with very high memory capacity.

Importance: HIGH

Good value: >=128 GB

64 GB
ASRock B550 Phantom Gaming ITX AX supports up to 64 GB of memory, which is less than 62.6% of motherboards and equal to 24.3% of motherboards.
Memory channels
What it is: The memory channel configuration supported by the motherboard platform.
When it matters: When memory bandwidth matters for your build.

Importance: MEDIUM

2
ASRock B550 Phantom Gaming ITX AX supports 2 memory channels, which is more than 0.2% of motherboards and equal to 92.5% of motherboards.
Maximum RAM speed
What it is: The highest officially supported memory speed for the motherboard.
When it matters: When you choose RAM and want to know the supported speed ceiling.

Importance: HIGH

Good value: >=6400 MT/s

5,400 MT/s
ASRock B550 Phantom Gaming ITX AX supports memory speeds up to 5400 MT/s, which is higher than that of 68.2% of motherboards and equal to that of 0.6% of motherboards.
maximum depends on CPU configuration
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N. of M.2 sockets
What it is: The number of M.2 slots available on the motherboard.
When it matters: When you want room for more NVMe or M.2 drives.

Importance: HIGH

Good value: >=3

2
ASRock B550 Phantom Gaming ITX AX has 2 M.2 sockets, which is more than 30.8% of motherboards and equal to 34.6% of motherboards.
M.2 slot interface per slot
What it is: The storage or PCIe interface available for each M.2 slot on the motherboard.
When it matters: When you want to check which drives each M.2 slot can use.

Importance: HIGH

1x PCIe 4.0 x4, 1x PCIe 3.0 x4/SATA
ASRock B550 Phantom Gaming ITX AX offers 1x PCIe 4.0x4, 1x PCIe 3.0x4/SATA for M.2 slot interfaces, which is faster than that of 53.6% of motherboards and equal to that of 2.4% of motherboards.
N. of SATA 3 connectors
What it is: The number of SATA 6Gb/s connectors on the motherboard.
When it matters: When you plan to connect multiple SATA drives.

Importance: MEDIUM

Good value: >=6

4
ASRock B550 Phantom Gaming ITX AX has 4 SATA 3 connectors, which is more than 5.6% of motherboards and equal to 46.3% of motherboards.
Supported RAID levels
What it is: The RAID modes officially supported by the motherboard storage platform.
When it matters: When you plan to use multiple drives in a RAID setup.

Importance: MEDIUM

0/1/10
ASRock B550 Phantom Gaming ITX AX supports RAID levels 0/1/10, which is narrower than 68.3% of motherboards and equal to 23.2% of motherboards.
JBOD excluded from RAID-level set
NVMe RAID support
What it is: Shows whether the board supports RAID configurations that use NVMe SSDs.
When it matters: When you plan to use multiple NVMe drives in RAID.

Importance: LOW

yes
ASRock B550 Phantom Gaming ITX AX supports NVMe RAID. 40.3% of motherboards support this feature.
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N. of PCIe 5.0 x16 slots
What it is: The number of PCIe 5.0 x16 physical slots on the motherboard.
When it matters: When you want the newest high-bandwidth expansion slots.

Importance: HIGH

Good value: >=1

0
ASRock B550 Phantom Gaming ITX AX has 0 PCIe 5.0x16 slots, which is equal to 68.5% of motherboards.
N. of PCIe 4.0 x16 slots
What it is: The number of PCIe 4.0 x16 physical slots on the motherboard.
When it matters: When you want more room for modern expansion cards.

Importance: HIGH

Good value: >=1

1
ASRock B550 Phantom Gaming ITX AX has 1 PCIe 4.0x16 slots, which is more than 55.6% of motherboards and equal to 35.3% of motherboards.
N. of PCIe 3.0 x16 slots
What it is: The number of PCIe 3.0 x16 physical slots on the motherboard.
When it matters: When you need more full-length expansion slots.

Importance: MEDIUM

0
ASRock B550 Phantom Gaming ITX AX has 0 PCIe 3.0x16 slots, which is fewer than 59.5% of motherboards and equal to 40.5% of motherboards.
PCIe slot electrical configuration
What it is: The actual lane wiring used by the motherboard PCIe slots.
When it matters: When you need to know how much bandwidth each slot really gets.

Importance: HIGH

x16
ASRock B550 Phantom Gaming ITX AX uses x16 for PCIe slot electrical configuration, which is less flexible than that of 86.5% of motherboards and equal to that of 9.3% of motherboards.
PCIe bifurcation support
What it is: Shows whether the board can split PCIe lanes across multiple devices from one slot or link.
When it matters: When you plan multi-SSD adapters or more advanced expansion setups.

Importance: MEDIUM

yes
ASRock B550 Phantom Gaming ITX AX supports PCIe bifurcation. 39.1% of motherboards support this feature.
x8/x8, x8/x4/x4.
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Total USB ports (rear I/O)
What it is: The total number of rear USB ports available on the motherboard.
When it matters: When you use many USB devices directly from the back of the PC.

Importance: MEDIUM

Good value: >=8

6
ASRock B550 Phantom Gaming ITX AX has 6 USB ports (rear I/O), which is fewer than 64.2% of motherboards and equal to 32.9% of motherboards.
Total USB ports (including headers)
What it is: The total number of USB ports supported when rear ports and internal headers are counted together.
When it matters: When you want to know the board's full USB expansion potential.

Importance: MEDIUM

Good value: >=14

11
ASRock B550 Phantom Gaming ITX AX has 11 USB ports (including headers), which is fewer than 89% of motherboards and equal to 3% of motherboards.
Total USB-C ports (rear I/O)
What it is: The total number of rear USB-C ports on the motherboard.
When it matters: When you want more USB-C devices connected without adapters.

Importance: MEDIUM

Good value: >=1

1
ASRock B550 Phantom Gaming ITX AX has 1 USB-C ports (rear I/O), which is more than 35.4% of motherboards and equal to 48.8% of motherboards.
Total USB-C ports (including headers)
What it is: The total number of USB-C ports supported when rear ports and internal headers are counted together.
When it matters: When you want more USB-C connectivity across the whole build.

Importance: MEDIUM

Good value: >=2

2
ASRock B550 Phantom Gaming ITX AX has 2 USB-C ports (including headers), which is more than 51.8% of motherboards and equal to 32.8% of motherboards.
N. of USB 3.2 Gen2x2 ports (USB-C)
What it is: The number of rear USB 3.2 Gen2x2 Type-C ports on the motherboard.
When it matters: When you want very fast USB-C connectivity on the rear I/O.

Importance: HIGH

Good value: >=1

0
ASRock B550 Phantom Gaming ITX AX has 0 USB 3.2 Gen2x2 ports (USB-C), which is equal to 81.6% of motherboards.
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LAN speed
What it is: The maximum wired Ethernet speed supported by the motherboard.
When it matters: When you want faster wired networking.

Importance: HIGH

Good value: 2.5GbE

2.5 Gbps
ASRock B550 Phantom Gaming ITX AX supports LAN speeds up to 2.5 Gbps, which is higher than that of 49.2% of motherboards and equal to that of 41.5% of motherboards.
LAN controller
What it is: The model of onboard Ethernet controller used by the motherboard.
When it matters: When you compare networking hardware quality and features.

Importance: MEDIUM

Intel I225-V
ASRock B550 Phantom Gaming ITX AX uses the Intel I225-V LAN controller, which is more advanced than that of 86.3% of motherboards and equal to that of 5.7% of motherboards.
N. of RJ45 ports
What it is: The number of wired Ethernet ports on the motherboard.
When it matters: When you need one or more wired network connections.

Importance: LOW

1
ASRock B550 Phantom Gaming ITX AX has 1 RJ45 ports, which is equal to 85.6% of motherboards.
Wi-Fi connectivity
What it is: Shows whether the motherboard includes onboard Wi-Fi hardware instead of requiring a separate adapter.
When it matters: When you want wireless networking without adding an extra card.

Importance: MEDIUM

yes
ASRock B550 Phantom Gaming ITX AX supports Wi-Fi connectivity. 50.9% of motherboards support this feature.
Wi-Fi version
What it is: The supported Wi-Fi generation, such as Wi-Fi 6 or Wi-Fi 7.
When it matters: When you care about wireless speed and router compatibility.

Importance: MEDIUM

Good value: Wi-Fi 6E (802.11ax)

Wi-Fi 6 (802.11ax)
ASRock B550 Phantom Gaming ITX AX supports Wi-Fi 6 (802.11ax), which is newer than that of 60.4% of motherboards and equal to that of 11.6% of motherboards.
Show more
Audio codec
What it is: The onboard audio codec used by the motherboard.
When it matters: When sound quality from the built-in audio matters to you.

Importance: MEDIUM

Realtek ALC1220
ASRock B550 Phantom Gaming ITX AX uses the Realtek ALC1220 audio codec, which is more advanced than that of 65.1% of motherboards and equal to that of 13% of motherboards.
Audio channels
What it is: The audio channel configuration supported by the onboard sound solution.
When it matters: When you want surround sound from the motherboard audio outputs.

Importance: LOW

Good value: 7.1

7.1
ASRock B550 Phantom Gaming ITX AX offers 7.1 audio channels, which is more than 4.9% of motherboards and equal to 95.1% of motherboards.
Audio SNR
What it is: The signal-to-noise ratio of the onboard audio solution.
When it matters: When you care about cleaner onboard audio output.

Importance: MEDIUM

Good value: >=120 dB

120 dB
ASRock B550 Phantom Gaming ITX AX has an audio SNR of 120 dB, which is higher than that of 55% of motherboards and equal to that of 41.5% of motherboards.
Headphone amp support
What it is: Shows whether the onboard audio path includes dedicated headphone amplification for harder-to-drive headsets.
When it matters: When you use harder-to-drive headphones from the onboard audio.

Importance: LOW

yes
ASRock B550 Phantom Gaming ITX AX supports a headphone amp. 37% of motherboards support this feature.
N. of 3.5mm audio jacks
What it is: The number of rear 3.5mm audio jacks on the motherboard.
When it matters: When you want more analog audio connection options.

Importance: LOW

Good value: >=5

3
ASRock B550 Phantom Gaming ITX AX has 3 3.5mm audio jacks, which is fewer than 50.3% of motherboards and equal to 38.2% of motherboards.
Show more
VRM phases
What it is: The number of power-delivery phases used by the motherboard VRM.
When it matters: When you care about CPU power delivery and overclocking headroom.

Importance: HIGH

Good value: >=12

8
ASRock B550 Phantom Gaming ITX AX has 8 VRM phases, which is fewer than 71.9% of motherboards and equal to 6.3% of motherboards.
N. of CPU power connectors
What it is: The number of CPU power connectors on the motherboard.
When it matters: When you care about power delivery for higher-end CPUs.

Importance: HIGH

Good value: >=2

1
ASRock B550 Phantom Gaming ITX AX has 1 CPU power connectors, which is equal to 54.5% of motherboards.
N. of fan headers
What it is: The number of headers available for case or CPU fans.
When it matters: When your build uses several fans.

Importance: MEDIUM

Good value: >=6

3
ASRock B550 Phantom Gaming ITX AX has 3 fan headers, which is fewer than 76.7% of motherboards and equal to 15% of motherboards.
Pump header
What it is: Shows whether the motherboard includes a dedicated header designed for a liquid-cooling pump.
When it matters: When you build with an AIO or custom liquid cooling loop.

Importance: MEDIUM

yes
ASRock B550 Phantom Gaming ITX AX has a pump header. 23.1% of motherboards include this feature.
Pump header max current
What it is: The maximum current the dedicated pump header can supply.
When it matters: When you want to make sure the pump header can power your cooling setup.

Importance: LOW

Good value: >=2 A

2 A
ASRock B550 Phantom Gaming ITX AX supports up to 2 A on the pump header, which is higher than that of 43.3% of motherboards and equal to that of 33.4% of motherboards.
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ASRock B550 Phantom Gaming ITX AX vs the average motherboard

  • Integrated I/O shield
    ASRock B550 Phantom Gaming ITX AX has an integrated I/O shield, while the average motherboard does not. 46.1% of motherboards include an integrated I/O shield.
    What it is: Shows whether the rear I/O shield comes pre-mounted on the motherboard instead of being installed separately.
    When it matters: When you want an easier motherboard installation process.

    Importance: LOW

    ASRock B550 Phantom Gaming ITX AX has an integrated I/O shield, while the average motherboard does not. 46.1% of motherboards include an integrated I/O shield.
  • 1 more USB 3.2 Gen2 USB-C ports
    ASRock B550 Phantom Gaming ITX AX has more USB 3.2 Gen2 USB-C ports than the average motherboard (1 vs 0). The average motherboard has 0 USB 3.2 Gen2 USB-C port/s.
    What it is: The number of rear USB 3.2 Gen2 Type-C ports on the motherboard.
    When it matters: When you want faster rear USB-C connectivity.

    Importance: HIGH

    Good value: >=1

    ASRock B550 Phantom Gaming ITX AX has more USB 3.2 Gen2 USB-C ports than the average motherboard (1 vs 0). The average motherboard has 0 USB 3.2 Gen2 USB-C port/s.1 vs 0
  • 1 more PCIe 4.0x16 slots
    ASRock B550 Phantom Gaming ITX AX has more PCIe 4.0x16 slots than the average motherboard (1 vs 0). The average motherboard has 0 PCIe 4.0x16 slot/s.
    What it is: The number of PCIe 4.0 x16 physical slots on the motherboard.
    When it matters: When you want more room for modern expansion cards.

    Importance: HIGH

    Good value: >=1

    ASRock B550 Phantom Gaming ITX AX has more PCIe 4.0x16 slots than the average motherboard (1 vs 0). The average motherboard has 0 PCIe 4.0x16 slot/s.1 vs 0
  • Supports Wi-Fi
    ASRock B550 Phantom Gaming ITX AX supports Wi-Fi connectivity, while the average motherboard does not. 49.1% of motherboards support Wi-Fi connectivity.
    What it is: Shows whether the motherboard includes onboard Wi-Fi hardware instead of requiring a separate adapter.
    When it matters: When you want wireless networking without adding an extra card.

    Importance: MEDIUM

    ASRock B550 Phantom Gaming ITX AX supports Wi-Fi connectivity, while the average motherboard does not. 49.1% of motherboards support Wi-Fi connectivity.
  • Newer CPU socket
    ASRock B550 Phantom Gaming ITX AX has newer CPU socket than the average motherboard (AM4 vs LGA 1,151). The average motherboard uses LGA 1,151 CPU socket.
    What it is: The socket type the motherboard is built to support.
    When it matters: When you need the motherboard to match a specific CPU.

    Importance: HIGH

    ASRock B550 Phantom Gaming ITX AX has newer CPU socket than the average motherboard (AM4 vs LGA 1,151). The average motherboard uses LGA 1,151 CPU socket.AM4 vs LGA 1151
  • Supports ECC memory
    ASRock B550 Phantom Gaming ITX AX supports ECC memory, while the average motherboard does not. 20.9% of motherboards support ECC memory.
    ECC requires compatible CPU.
    What it is: Shows whether the motherboard can work with ECC memory on supported CPU and platform combinations.
    When it matters: When stability and error correction matter in your system.

    Importance: MEDIUM

    ASRock B550 Phantom Gaming ITX AX supports ECC memory, while the average motherboard does not. 20.9% of motherboards support ECC memory.
  • Supports Bluetooth
    ASRock B550 Phantom Gaming ITX AX supports Bluetooth, while the average motherboard does not. 47% of motherboards support Bluetooth.
    What it is: Shows whether the motherboard includes built-in Bluetooth for wireless peripherals and accessories.
    When it matters: When you want to connect wireless peripherals without an adapter.

    Importance: LOW

    ASRock B550 Phantom Gaming ITX AX supports Bluetooth, while the average motherboard does not. 47% of motherboards support Bluetooth.
  • Better audio codec
    ASRock B550 Phantom Gaming ITX AX has better audio codec than the average motherboard (Realtek ALC1,220 vs Realtek ALC898). The average motherboard uses Realtek ALC898 audio codec.
    What it is: The onboard audio codec used by the motherboard.
    When it matters: When sound quality from the built-in audio matters to you.

    Importance: MEDIUM

    ASRock B550 Phantom Gaming ITX AX has better audio codec than the average motherboard (Realtek ALC1,220 vs Realtek ALC898). The average motherboard uses Realtek ALC898 audio codec.Realtek ALC1220 vs Realtek ALC898
  • Integrated I/O shield
    ASRock B550 Phantom Gaming ITX AX has an integrated I/O shield, while the average motherboard does not. 46.1% of motherboards include an integrated I/O shield.
  • Newer CPU socket
    ASRock B550 Phantom Gaming ITX AX has newer CPU socket than the average motherboard (AM4 vs LGA 1,151). The average motherboard uses LGA 1,151 CPU socket.
  • Supports ECC memory
    ASRock B550 Phantom Gaming ITX AX supports ECC memory, while the average motherboard does not. 20.9% of motherboards support ECC memory.
  • 17.4% higher maximum RAM speed
    ASRock B550 Phantom Gaming ITX AX has a higher maximum RAM speed than the average motherboard (5,400 MT/s vs 4,600 MT/s). The average motherboard supports RAM speed of 4,600 MT/s.
  • 1 more PCIe 4.0x16 slots
    ASRock B550 Phantom Gaming ITX AX has more PCIe 4.0x16 slots than the average motherboard (1 vs 0). The average motherboard has 0 PCIe 4.0x16 slot/s.
  • 1 more USB 3.2 Gen2 USB-C ports
    ASRock B550 Phantom Gaming ITX AX has more USB 3.2 Gen2 USB-C ports than the average motherboard (1 vs 0). The average motherboard has 0 USB 3.2 Gen2 USB-C port/s.
  • 1 more USB 3.2 Gen2 headers
    ASRock B550 Phantom Gaming ITX AX has more USB 3.2 Gen2 headers than the average motherboard (1 vs 0). The average motherboard has 0 USB 3.2 Gen2 header/s.
  • 1 more total USB-C connections
    ASRock B550 Phantom Gaming ITX AX has more total USB-C connections than the average motherboard (2 vs 1). The average motherboard has 1 total USB-C connections.
  • Supports Wi-Fi
    ASRock B550 Phantom Gaming ITX AX supports Wi-Fi connectivity, while the average motherboard does not. 49.1% of motherboards support Wi-Fi connectivity.
  • Supports Bluetooth
    ASRock B550 Phantom Gaming ITX AX supports Bluetooth, while the average motherboard does not. 47% of motherboards support Bluetooth.
  • Better audio codec
    ASRock B550 Phantom Gaming ITX AX has better audio codec than the average motherboard (Realtek ALC1,220 vs Realtek ALC898). The average motherboard uses Realtek ALC898 audio codec.
  • 5 dB higher audio SNR
    ASRock B550 Phantom Gaming ITX AX has a higher audio SNR than the average motherboard (120 dB vs 115 dB). The average motherboard has audio SNR of 115 dB.
  • 135 mm shorter
    ASRock B550 Phantom Gaming ITX AX is shorter than the average motherboard (170 mm vs 305 mm). The average motherboard height is 305 mm.
  • 74 mm narrower
    ASRock B550 Phantom Gaming ITX AX is narrower than the average motherboard (170 mm vs 244 mm). The average motherboard width is 244 mm.

Total
Platform & Features
Memory
Expansion
Ports & USB
Network
Audio
Power & Cooling
  • More basic motherboard chipset
    ASRock B550 Phantom Gaming ITX AX has more basic motherboard chipset than the average motherboard (AMD B550 vs Intel B860). The average motherboard uses Intel B860 chipset.
  • No BIOS flashback support
    ASRock B550 Phantom Gaming ITX AX does not support BIOS flashback, while the average motherboard does. 50.8% of motherboards support BIOS flashback.
    requires CPU/RAM
  • No TPM connector
    ASRock B550 Phantom Gaming ITX AX does not have a TPM connector, while the average motherboard does. 86.7% of motherboards include a TPM connector.
  • 2 fewer memory slots
    ASRock B550 Phantom Gaming ITX AX has fewer memory slots than the average motherboard (2 vs 4). The average motherboard has 4 memory slot/s.
  • 50% less maximum memory capacity
    ASRock B550 Phantom Gaming ITX AX has fewer maximum memory capacity than the average motherboard (64 GB vs 128 GB). The average motherboard supports 128 GB of memory.
  • Slower M.2 slot interfaces
    ASRock B550 Phantom Gaming ITX AX has slower M.2 slot interfaces than the average motherboard (1x PCIe 4.0x4, 1x PCIe 3.0x4/SATA vs 1x PCIe 5.0x4, 2x PCIe 4.0x4). The average motherboard uses 1x PCIe 5.0x4, 2x PCIe 4.0x4 M.2 slot interfaces.
  • Fewer RAID options
    ASRock B550 Phantom Gaming ITX AX has fewer RAID options than the average motherboard (0/1/10 vs 0/1/5/10). The average motherboard has 0/1/5/10 RAID level/s.
    JBOD excluded from RAID-level set
  • No multi-GPU support
    ASRock B550 Phantom Gaming ITX AX does not support multi-GPU, while the average motherboard does. 54.6% of motherboards support multi-GPU.
    Single PCIe x16 slot only.
  • 1 fewer PCIe x1 slots
    ASRock B550 Phantom Gaming ITX AX has fewer PCIe x1 slots than the average motherboard (0 vs 1). The average motherboard has 1 PCIe x1 slot/s.
  • Less flexible PCIe lane configuration
    ASRock B550 Phantom Gaming ITX AX has less flexible PCIe lane configuration than the average motherboard (x16 vs x16/x1). The average motherboard uses x16/x1 PCIe slot lane configuration.
  • 1 fewer PCIe 3.0x16 slots
    ASRock B550 Phantom Gaming ITX AX has fewer PCIe 3.0x16 slots than the average motherboard (0 vs 1). The average motherboard has 1 PCIe 3.0x16 slot/s.
  • 2 fewer rear USB ports
    ASRock B550 Phantom Gaming ITX AX has fewer rear USB ports than the average motherboard (6 vs 8). The average motherboard has 8 rear USB port/s.
  • 4 fewer total USB connections
    ASRock B550 Phantom Gaming ITX AX has fewer total USB connections than the average motherboard (11 vs 15). The average motherboard has 15 total USB connections.
  • 1 fewer USB 2.0 headers
    ASRock B550 Phantom Gaming ITX AX has fewer USB 2.0 headers than the average motherboard (1 vs 2). The average motherboard has 2 USB 2.0 header/s.
  • 1 fewer PS/2 ports
    ASRock B550 Phantom Gaming ITX AX has fewer PS/2 ports than the average motherboard (0 vs 1). The average motherboard has 1 PS/2 port/s.
  • 2 fewer USB 2.0 ports
    ASRock B550 Phantom Gaming ITX AX has fewer USB 2.0 ports than the average motherboard (0 vs 2). The average motherboard has 2 USB 2.0 port/s.
  • Older Bluetooth version
    ASRock B550 Phantom Gaming ITX AX has older Bluetooth version than the average motherboard (5.2 vs 5.4). The average motherboard supports Bluetooth 5.4.
  • 2 fewer 3.5mm audio jacks
    ASRock B550 Phantom Gaming ITX AX has fewer 3.5mm audio jacks than the average motherboard (3 vs 5). The average motherboard has 5 3.5mm audio jacks.
  • No optical S/PDIF out
    ASRock B550 Phantom Gaming ITX AX does not have optical S/PDIF out, while the average motherboard does. 55.7% of motherboards include optical S/PDIF out.
  • Fewer VRM phases
    ASRock B550 Phantom Gaming ITX AX has fewer VRM phases than the average motherboard (8 vs 10). The average motherboard has 10 VRM phase/s.
  • 2 fewer fan headers
    ASRock B550 Phantom Gaming ITX AX has fewer fan headers than the average motherboard (3 vs 5). The average motherboard has 5 fan header/s.
  • 1 fewer ARGB headers
    ASRock B550 Phantom Gaming ITX AX has fewer ARGB headers than the average motherboard (1 vs 2). The average motherboard has 2 ARGB header/s.
  • More basic motherboard chipset
    ASRock B550 Phantom Gaming ITX AX has more basic motherboard chipset than the average motherboard (AMD B550 vs Intel B860). The average motherboard uses Intel B860 chipset.
    What it is: The chipset that defines the motherboard platform and many of its features.
    When it matters: When you compare platform features, connectivity, and CPU support.

    Importance: HIGH

    ASRock B550 Phantom Gaming ITX AX has more basic motherboard chipset than the average motherboard (AMD B550 vs Intel B860). The average motherboard uses Intel B860 chipset.AMD B550 vs Intel B860
  • 2 fewer memory slots
    ASRock B550 Phantom Gaming ITX AX has fewer memory slots than the average motherboard (2 vs 4). The average motherboard has 4 memory slot/s.
    What it is: The number of RAM slots on the motherboard.
    When it matters: When you want more room for future memory upgrades.

    Importance: HIGH

    Good value: >=4

    ASRock B550 Phantom Gaming ITX AX has fewer memory slots than the average motherboard (2 vs 4). The average motherboard has 4 memory slot/s.2 vs 4
  • 2 fewer rear USB ports
    ASRock B550 Phantom Gaming ITX AX has fewer rear USB ports than the average motherboard (6 vs 8). The average motherboard has 8 rear USB port/s.
    What it is: The total number of rear USB ports available on the motherboard.
    When it matters: When you use many USB devices directly from the back of the PC.

    Importance: MEDIUM

    Good value: >=8

    ASRock B550 Phantom Gaming ITX AX has fewer rear USB ports than the average motherboard (6 vs 8). The average motherboard has 8 rear USB port/s.6 vs 8
  • Slower M.2 slot interfaces
    ASRock B550 Phantom Gaming ITX AX has slower M.2 slot interfaces than the average motherboard (1x PCIe 4.0x4, 1x PCIe 3.0x4/SATA vs 1x PCIe 5.0x4, 2x PCIe 4.0x4). The average motherboard uses 1x PCIe 5.0x4, 2x PCIe 4.0x4 M.2 slot interfaces.
    What it is: The storage or PCIe interface available for each M.2 slot on the motherboard.
    When it matters: When you want to check which drives each M.2 slot can use.

    Importance: HIGH

    ASRock B550 Phantom Gaming ITX AX has slower M.2 slot interfaces than the average motherboard (1x PCIe 4.0x4, 1x PCIe 3.0x4/SATA vs 1x PCIe 5.0x4, 2x PCIe 4.0x4). The average motherboard uses 1x PCIe 5.0x4, 2x PCIe 4.0x4 M.2 slot interfaces.1x PCIe 4.0x4, 1x PCIe 3.0x4/SATA vs 1x PCIe 5.0x4, 2x PCIe 4.0x4
  • 50% less maximum memory capacity
    ASRock B550 Phantom Gaming ITX AX has fewer maximum memory capacity than the average motherboard (64 GB vs 128 GB). The average motherboard supports 128 GB of memory.
    What it is: The largest total amount of RAM the motherboard supports.
    When it matters: When you plan a build with very high memory capacity.

    Importance: HIGH

    Good value: >=128 GB

    ASRock B550 Phantom Gaming ITX AX has fewer maximum memory capacity than the average motherboard (64 GB vs 128 GB). The average motherboard supports 128 GB of memory.64 GB vs 128 GB
  • 4 fewer total USB connections
    ASRock B550 Phantom Gaming ITX AX has fewer total USB connections than the average motherboard (11 vs 15). The average motherboard has 15 total USB connections.
    What it is: The total number of USB ports supported when rear ports and internal headers are counted together.
    When it matters: When you want to know the board's full USB expansion potential.

    Importance: MEDIUM

    Good value: >=14

    ASRock B550 Phantom Gaming ITX AX has fewer total USB connections than the average motherboard (11 vs 15). The average motherboard has 15 total USB connections.11 vs 15
  • No BIOS flashback support
    ASRock B550 Phantom Gaming ITX AX does not support BIOS flashback, while the average motherboard does. 50.8% of motherboards support BIOS flashback.
    requires CPU/RAM
    What it is: Shows whether the motherboard can update BIOS without needing a fully installed or supported CPU to boot first.
    When it matters: When you may need to update BIOS before the system can boot.

    Importance: MEDIUM

    ASRock B550 Phantom Gaming ITX AX does not support BIOS flashback, while the average motherboard does. 50.8% of motherboards support BIOS flashback.
  • Fewer RAID options
    ASRock B550 Phantom Gaming ITX AX has fewer RAID options than the average motherboard (0/1/10 vs 0/1/5/10). The average motherboard has 0/1/5/10 RAID level/s.
    JBOD excluded from RAID-level set
    What it is: The RAID modes officially supported by the motherboard storage platform.
    When it matters: When you plan to use multiple drives in a RAID setup.

    Importance: MEDIUM

    ASRock B550 Phantom Gaming ITX AX has fewer RAID options than the average motherboard (0/1/10 vs 0/1/5/10). The average motherboard has 0/1/5/10 RAID level/s.0/1/10 vs 0/1/5/10
Total
Platform & Features
Memory
Storage
Expansion
Ports & USB
Network
Audio
Power & Cooling

Graphic comparison of ASRock B550 Phantom Gaming ITX AX and

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Third-party reviews

United Kingdom
amazon
4.2
385 Reviews
United States
Amazon_logo.png
4.3
391 Reviews

(Reviews last updated: May 2026)

What customers like about ASRock B550 Phantom Gaming ITX AX?

  • High-quality 8-phase VRM with 90A power stages capable of handling high-end CPUs like the Ryzen 3950X or 5950X.
  • Dual M.2 slots (one PCIe 4.0 front, one PCIe 3.0 rear) are rare for Mini-ITX boards.
  • Effective passive cooling design with no noisy chipset fan.
  • Features a front-panel USB-C header which is often missing on competing ITX boards.
  • Robust networking with Intel 2.5Gb LAN and Wi-Fi 6 (AX) support.
  • Standard AM4 mounting brackets provide better compatibility and ease for AIO or air cooler installation.
  • Strong out-of-the-box performance and a user-friendly UEFI for simple overclocking.

What customers dislike about ASRock B550 Phantom Gaming ITX AX?

  • Lacks a BIOS Flashback button, which can make updating for newer CPUs difficult without an older processor.
  • Right-angled SATA ports can cause significant clearance issues in tight Mini-ITX cases like the Dan A4.
  • Reported issues with incorrect sensor readings that can lead to artificially high voltage or power draw in some BIOS versions.
  • Occasional Bluetooth connectivity 'disappearing' bugs that require a full power cycle to resolve.
  • Clear CMOS header is awkwardly placed and can be covered by the graphics card once installed.
  • Certain M.2 SSDs (like the WD SN750) may break fan control monitoring when used in the primary front slot.
  • No optical audio output (S/PDIF) on the rear I/O panel.

Video reviews

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