Bench log · 205 components reviewed across 12 slotsReader-supported: we may earn from qualifying Amazon purchases
ASRock B550 PG ITX/AXMOBO

MOBOMotherboards·ASRock

ASRock B550 PG ITX/AX

4.4
Shed ScoreEditorial rating out of 5, based on specs, build quality and value in its class.
  • WiFi 6 built-in
  • PCIe 4.0 ready
  • Compact ITX power

The ASRock B550 PG ITX/AX is a well-rounded Mini-ITX motherboard that punches above its price class, offering PCIe 4.0 connectivity, robust power delivery, and integrated WiFi 6 for small form factor AMD builds.

  • SocketAM4
  • Form FactorMini-ITX
  • Memory SupportDDR4 up to 128GB
Check price on Amazon Full datasheet

As an Amazon Associate we earn from qualifying purchases.

// Datasheet

Technical specifications

B550-ITX-AX5 fields
SocketAM4
Form FactorMini-ITX
Memory SupportDDR4 up to 128GB
WirelessWiFi 6 802.11ax + Bluetooth 5.2
LAN2.5 Gigabit Ethernet

// Verdict

Our take

4.4

The ASRock B550 PG ITX/AX is a well-rounded Mini-ITX motherboard that punches above its price class, offering PCIe 4.0 connectivity, robust power delivery, and integrated WiFi 6 for small form factor AMD builds. It's an excellent choice for compact gaming rigs or HTPC builds that still demand serious performance, though buyers should ensure adequate case airflow to keep the VRM cool under load.

// Trade-offs

Pros and cons

+What we like

  • Excellent VRM for ITX at this price point
  • PCIe 4.0 support for both GPU and NVMe storage
  • Built-in WiFi 6 eliminates need for separate card
  • Compact size doesn't compromise on connectivity
  • BIOS flashback button for easy CPU upgrades without a CPU installed

−Watch out for

  • Only one full-length PCIe slot (expected for ITX but limiting)
  • VRM can run warm under sustained heavy loads without case airflow
  • No PS/2 ports for legacy peripherals
  • Limited to two RAM slots, capping total memory capacity

// Feature set

Key features

  • 01AMD AM4 socket supporting Ryzen 5000/3000 series processors
  • 02Mini-ITX form factor for compact builds
  • 03WiFi 6 (802.11ax) and Bluetooth 5.2 integrated
  • 042.5G Ethernet LAN plus Killer WiFi solution
  • 05Dual M.2 slots with PCIe 4.0 support
  • 06Dr. MOS power delivery with premium 90A chokes
  • 07HDMI 2.1 and DisplayPort 1.4 outputs
  • 08USB 3.2 Gen2 Type-C front panel header
  • 09ASRock Polychrome RGB sync header

// Long read

Full review

The ASRock B550 ITX AX is a compact Mini-ITX motherboard built around AMD's B550 chipset, designed for enthusiasts and system builders who want full AM4 platform performance without sacrificing it to a small form factor. Supporting AMD Ryzen 5000, 4000G, and 3000 series processors, the board gives users access to PCIe 4.0 connectivity for both the graphics slot and primary M.2 NVMe storage, ensuring that even in a tiny footprint there's no compromise on bandwidth for modern GPUs and high-speed SSDs. The 10-phase power delivery system is unusually robust for an ITX board, allowing it to comfortably handle higher-core-count Ryzen chips while maintaining stable voltages under sustained load, which is critical in small cases where thermal headroom is already at a premium.

Connectivity is a major focus of this motherboard, living up to the "AX" designation in its name through integrated Wi-Fi 6 support via an Intel AX200 module, paired with Bluetooth 5.1 for wireless peripherals. On the rear I/O, users get a strong mix of USB 3.2 Gen2 Type-A and Type-C ports, along with a 2.5GbE LAN port for high-speed wired networking, making it a practical choice for both gaming rigs and compact workstation builds. Audio is handled by a Realtek ALC1200 codec, delivering clean output for builders who want a capable small-form-factor machine that doesn't need an external sound card. The single full-length PCIe 4.0 x16 slot is reinforced with steel shielding, protecting against the physical strain of heavier modern graphics cards, a thoughtful touch for an ITX chassis where the board often bears more mechanical stress due to limited case anchoring points.

Despite its size, the ASRock B550 ITX AX doesn't skimp on practical building features: dual M.2 slots allow for both a primary high-speed NVMe boot drive and additional storage expansion, a rarity in many ITX designs. The board also includes a comprehensive set of fan headers and a debug LED system to simplify troubleshooting in tight case environments where diagnosing issues can otherwise be tedious. Aimed squarely at users building small form factor gaming PCs, home theater rigs, or compact productivity machines, this motherboard pairs AMD's efficient B550 platform with premium ITX engineering, making it a strong foundation for anyone who wants desktop-class performance and expandability inside a case that can fit on a shelf.

See it on Amazon