ASUS ROG Strix B550-I Gaming Mini-ITX Motherboard: features and specs

The ASUS ROG Strix B550-I Gaming is a Mini-ITX motherboard for AMD's AM4 socket, made for small-form-factor PCs built around Ryzen processors. A Mini-ITX board is only about 6.7 inches square, so it packs networking, storage and display connections into very little space. Here is what its specs mean and what to check before planning a compact build.

Which processors it supports

The board uses the AM4 socket with the B550 chipset. ASUS pairs it with Ryzen 5000 and 3rd Gen Ryzen processors. AM4 is an older socket than AM5, so it takes DDR4 memory. The listing mentions DDR4 overclocking up to 5100+ MHz, which depends on the memory kit and processor. Check ASUS's CPU support list before buying, as some processors need a BIOS update.

Power and cooling on a small board

ASUS describes 8+2 DrMOS power stages with alloy chokes and durable capacitors for high-core-count Ryzen chips. Power stages turn the supply voltage into what the processor needs; DrMOS designs combine the switching parts in a single package.

With little room for airflow in small cases, cooling matters. ASUS lists VRM and chipset heatsinks using its Stack Cool 3+ design, which aims to boost passive cooling for key components under heavy load.

PCIe 4.0 and storage

There are two M.2 slots for NVMe SSDs, one of which has PCIe 4.0 x4 connectivity. PCIe 4.0 doubles the bandwidth of PCIe 3.0, so it suits fast SSDs. The board's single full-size expansion slot is where the graphics card goes; ASUS ties PCIe 4.0 to Ryzen 5000 and 3rd Gen CPUs, so check your processor supports it.

Networking, audio and video

On-board WiFi 6 (802.11ax) and Bluetooth 5.1 mean no add-in card is needed. The 2.5 Gb LAN port is faster than standard gigabit Ethernet if your router or switch supports it, and ASUS adds its LANGuard protection. Audio supports playback up to 32-bit/192kHz, per the listing.

Video outputs are HDMI 2.1 (4K at 60Hz) and DisplayPort 1.2, which work with processors that have integrated graphics. For USB there is a rear USB 3.2 Gen 2 Type-C port and a front-panel Type-C connector, which needs a case with a matching front port. Addressable Gen 2 RGB and Aura Sync handle lighting.

Who it suits

It suits builders making a compact Ryzen PC who want WiFi, fast wired networking and PCIe 4.0 in a very small footprint. If you want more expansion cards or drive slots, a larger board will give more room.

What to check before you buy

• Processor: confirm support and any BIOS update needed.
• Memory: it uses DDR4; check the board's tested memory list.
• Case: Mini-ITX cases vary a lot; check CPU cooler height, graphics card length and power supply type.
• Cooling: a small case needs a plan for airflow across the VRM and SSDs.
• Storage: two M.2 slots may limit you if you want several drives.
• Offers: the listing's Adobe offer dates have passed, so don't expect it to apply.

The short version

• A Mini-ITX AM4 motherboard (B550) for Ryzen 5000 and 3rd Gen processors.
• 8+2 DrMOS power stages and Stack Cool 3+ heatsinks.
• Dual M.2 NVMe slots, one with PCIe 4.0 x4.
• WiFi 6, Bluetooth 5.1 and 2.5 Gb LAN.
• HDMI 2.1, DisplayPort 1.2, USB 3.2 Gen 2 Type-C and addressable RGB.

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