This article covers ASRock マザーボード B450 M Steel Legend AMD Ryzen AM4 対応 B450 Micro ATX マザーボード 【国内正規代理店品】.

Overview

The ASRock B450M Steel Legend is a MicroATX motherboard built on the AMD B450 chipset, designed for Socket AM4 processors including Ryzen 2000, 3000, and 5000 series. It features four DDR4 memory slots supporting up to 64GB, an Ultra M.2 slot with PCIe Gen3 x4, and integrated RGB lighting. This board targets budget-conscious gamers and general users who need a reliable foundation for a mid-range PC build without unnecessary extras.

Compatibility Guide

This motherboard supports AMD Ryzen CPUs with Socket AM4. For Ryzen 5000 series (Vermeer), a BIOS update is required. Memory is standard DDR4, with speeds up to 3533MHz (OC) and capacity up to 64GB across four DIMM slots. The MicroATX form factor fits most small-to-mid tower cases. Power is supplied via a 24-pin ATX connector and an 8-pin EPS connector. Storage options include four SATA3 ports, one Ultra M.2 (PCIe Gen3 x4), and one M.2 SATA slot.

Product Info

Launched around 2019, the ASRock B450M Steel Legend typically retails for approximately ¥20,000 (tax included). The B450 chipset occupies the mid-range tier, lacking PCIe 4.0 but providing good feature balance for most practical builds. Warranty from the official Japanese distributor is usually 1–3 years. The rear I/O includes USB 3.1 Gen2 Type-A and Type-C, making it convenient for modern peripherals.

Best Use Cases

Budget Gaming Build: Pair with a Ryzen 5 3600 or 5600 for a capable 1080p gaming rig. The B450 chipset provides all essential connectivity at a low cost, letting users invest more in GPU and memory. Compact Home Office PC: With its MicroATX size, the board fits neatly in small cases. Ideal for an affordable productivity system running office applications, web browsing, and light content creation. * Platform Upgrader: If you're moving from an older Ryzen CPU to a Ryzen 5000 series, this board offers a straightforward upgrade path provided you update the BIOS first.

Things to Consider

Lack of PCIe 4.0 support is the biggest limitation – if you plan to use a PCIe 4.0 GPU or NVMe SSD at full speed, a B550 or X570 board would be a better choice. The VRM design with 6 phases is adequate for Ryzen 5 and 7 CPUs but may struggle with sustained heavy loads on a Ryzen 9. Always confirm BIOS version before installing a Ryzen 5000 CPU; you may need an older CPU to perform the update if the board isn't pre-updated. Additionally, the board has only one PCIe x16 slot (electrically wired as x16), so multi-GPU setups are not possible.

Product Disclosure (Amazon)

  • Manufacturer: ASRock
  • ASIN: B07MV9BMNY
  • Note: This article covers a manufacturer-made product based on Amazon listing details.