Gigabyte B550I AORUS Pro AX

The B550I AORUS Pro AX remains one of the most complete AM4 Mini-ITX boards still available, pairing a genuinely robust 8-phase 90A VRM with a rear-mounted M.2 slot layout that keeps front-facing heatsinks clear for airflow in tight ITX cases.

An 8-phase (6+2 configuration) direct digital design using Intersil ISL99390 90A Smart Power Stages delivers roughly 720A of combined output, a genuinely strong spec for an AM4 board this size and well-suited to Ryzen 5000-series chips including the 5800X3D. Two DDR4 DIMM slots support up to 64GB total capacity, with overclocked speeds up to DDR4-5300 achievable depending on the memory kit and CPU generation. A single PCIe x16 slot runs at PCIe 4.0 with Ryzen 5000/3000-series CPUs, dropping to PCIe 3.0 with Ryzen 5000G/4000G APUs. Two M.2 slots are provided: a front-facing M2A_CPU slot (PCIe 4.0/3.0 x4) and a rear-mounted M2B_SB slot (PCIe 3.0 x4) that keeps the front M.2 heatsink area clear. A Realtek 2.5GbE controller pairs with an Intel Wi-Fi 6 AX200 module (802.11ax, 160MHz, up to 2.4Gbps) for wireless. Audio uses a Realtek ALC1220-VB codec, and Q-Flash Plus allows BIOS updates without a CPU installed. Against the ASRock X570 Phantom Gaming-ITX/TB3 in this catalog, the B550I AORUS Pro AX offers two M.2 slots versus the ASRock board's one, though it lacks the built-in Thunderbolt 3 that distinguishes the X570 board.