Overview

ASRock's B550M Phantom Gaming 4 is a MicroATX motherboard built around the AMD B550 chipset, designed for Socket AM4 processors. It supports a wide range of Ryzen 5000, 4000G, and 3000 series CPUs, making it a popular choice for budget-conscious PC builders. The board is available through major retailers like online retailers as an official domestic authorized product, offering a solid balance of features and affordability.
Key highlights include a PCIe 4.0 x16 slot for modern graphics cards, a PCIe Gen4 M.2 slot for high-speed SSDs, and support for up to 128GB of DDR4 memory with XMP 2.0 profiles. The 8-phase premium power choke design ensures stable power delivery, while the high-density glass fiber PCB adds durability against moisture and electrical shorts.
In the market, this board sits comfortably in the entry-to-mid tier segment. It provides the essential features of the B550 platform without the extra cost of higher-end models, making it an excellent choice for mainstream gaming builds and everyday productivity systems.

Compatibility Guide

The motherboard uses the AMD Socket AM4, compatible with Ryzen 5000, 4000G, and 3000 series processors. This means you can drop in a Ryzen 5000 series CPU for modern Zen 3 performance without breaking the bank. The 4000G series APUs are also supported, allowing you to build a system without a discrete graphics card if needed.
Memory support includes four DDR4 UDIMM slots with a maximum capacity of 128GB. XMP 2.0 profiles are supported for easy overclocking of memory kits. However, the actual memory configuration and maximum speed depend on the installed CPU and operating system, so it's wise to check the manufacturer's specifications before purchasing high-speed modules.
Expansion options include one PCIe 4.0 x16 slot, one PCIe 3.0 x4 slot, and one PCIe 3.0 x1 slot. AMD CrossFireX multi-GPU setups are supported, providing flexibility for users who want to add multiple expansion cards. Storage connectivity includes one PCIe Gen4 x4 M.2 slot, one PCIe Gen3 x2 M.2 slot, and four SATA3 ports.
The board follows the MicroATX form factor (244 x 244mm), fitting into most MicroATX cases without issues. Standard ATX power supplies are compatible, and the rear I/O panel offers four USB 3.2 Gen1 Type-A ports and two USB 2.0 Type-A ports, along with front-panel headers for additional USB connectivity.

Product Info

This motherboard is part of ASRock's Phantom Gaming series, released around 2020.Check the retailer's page for the latest price. The price may fluctuate depending on the seller and timing.
Positioned in the entry-to-mid tier, the B550M Phantom Gaming 4 offers the core benefits of the B550 chipset—PCIe 4.0 support for M.2 SSDs and graphics cards—at a more accessible price point than X570 boards. It strips away non-essential features to keep costs down while retaining the essentials for a modern build.
Notable features include an 8-phase 50A premium power choke design, overvoltage spike protection, and a high-density glass fiber PCB. The inclusion of a PS/2 port and COM header pins also makes it suitable for legacy business environments where older peripherals are still in use.

Best Use Cases

For entry-level gamers aiming to play the latest titles at 1080p, this board is an ideal foundation. Pair it with a Ryzen 5000 series CPU and a mid-range graphics card to build a capable gaming rig without overspending. The PCIe 4.0 x16 slot ensures your GPU can perform at its full potential.
Budget-conscious DIY builders will appreciate the value proposition. The B550 chipset offers PCIe 4.0 support at a lower cost than X570, and this board includes all the necessary features for a mainstream build—DDR4 memory, PCIe Gen4 M.2 storage, and solid power delivery—without unnecessary extras.
Users looking to build a compact system will find the MicroATX form factor convenient. Combined with a 4000G series APU, you can create a small-form-factor media PC or office machine without a discrete GPU, saving both space and money.
However, if you need two full-speed PCIe 4.0 M.2 slots or plan to install many expansion cards, a full-size ATX board or an X570 chipset model might be a better fit.

Things to Consider

One limitation is that the second M.2 slot runs at PCIe Gen3 x2 speeds, which is slower than the primary Gen4 x4 slot. Additionally, using an M.2 slot may disable some SATA ports, so plan your storage configuration carefully. The board lacks built-in wireless networking, so you'll need to add a Wi-Fi adapter or PCIe card if you require wireless connectivity.
Video output ports (DisplayPort 1.4 and HDMI 2.1) are only functional when using an APU with integrated graphics.

Product Disclosure (Amazon)

  • Manufacturer: ASRock
  • Seller: Amazon.co.jp
  • Fulfilled by: Amazon.co.jp
  • ASIN: B08MXSQS49
  • Note: This article covers a manufacturer-made product based on Amazon listing details.