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ATX motherboard with black and silver heatsinks and four DDR4 slots

ASUS

ASUS ROG STRIX B550-A GAMING AM4 ATX AMD Motherboard 128GB DDR4

SKU CH-2D4Z-DZADE

ATX motherboard for AMD AM4 CPUs with four DDR4 slots supporting up to 128 GB and speeds from 2133 to 5100 MT/s

  • CPU Socket TypeAM4
  • CPU TypeSupports AMD Ryzen 5000 Series / 4000 G-Series / 3
  • ChipsetAMD B550
  • Number of Memory Slots4x288pin (DDR4)
  • Maximum Memory Supported128GB
  • Channel SupportedDual Channel
  • Supports AMD Ryzen 5000, 4000 G-Series and 3000 Series processors for broad CPU choice
  • Four DDR4 slots accept up to 128 GB for high-capacity memory builds
  • Dual-channel architecture with speeds up to 5100 MT/s when overclocked for fast data throughput
  • AMD B550 chipset provides modern platform features on the AM4 socket
  • BIOS update may be required before installing Zen 3 Ryzen 5000 series CPUs

AMD B550 ATX motherboard

The ASUS ROG STRIX B550-A GAMING is an ATX motherboard built on the AMD B550 chipset for the AM4 socket. It supports AMD Ryzen 5000 Series, 4000 G-Series and 3000 Series processors. Four 288-pin DDR4 slots provide dual-channel memory up to 128GB capacity.

Memory speed range and BIOS note

The board runs DDR4 at speeds from 2133 MT/s up to 5100 MT/s when overclocked with Ryzen 4000 G-Series CPUs, and up to 4600 MT/s with other supported processors. A BIOS update may be required before installing a Zen 3 Ryzen 5000 series CPU.

Suited for AM4 builders needing high memory capacity

This motherboard suits builders who want an AM4 platform with four DIMM slots for up to 128GB of DDR4. Users needing a newer socket, integrated Wi-Fi details, or a different form factor should look at other models.

Highlights

  • Supports AMD Ryzen 5000, 4000 G-Series and 3000 Series processors for broad CPU choice
  • Four DDR4 slots accept up to 128 GB for high-capacity memory builds
  • Dual-channel architecture with speeds up to 5100 MT/s when overclocked for fast data throughput
  • AMD B550 chipset provides modern platform features on the AM4 socket
  • BIOS update may be required before installing Zen 3 Ryzen 5000 series CPUs

Specifications

BrandASUS
CPU Socket TypeAM4
CPU TypeSupports AMD Ryzen 5000 Series / 4000 G-Series / 3
ChipsetAMD B550
Number of Memory Slots4x288pin (DDR4)
Maximum Memory Supported128GB
Channel SupportedDual Channel

Questions about this item

Will the BIOS chip on the ROG STRIX B550-A GAMING need replacing to run a Ryzen 5000 series CPU?

A BIOS update might be required for AMD Zen 3 Ryzen 5000 series CPU support. The board ships with a UEFI BIOS that can be updated via USB without replacing any hardware.

What memory speed ceiling appears first when all four DDR4 slots are populated on this B550 board?

The qualified vendor list tops out at DDR4 3200 for four-module configurations. Higher frequencies such as 3600 or 5100(OC) are validated with one or two modules only.

How hot does the B550 chipset heatsink get when the system runs all day?

The chipset uses a passive aluminium heatsink with no active fan, so it runs silently. Typical load temperatures stay within AM4 platform limits, but exact figures depend on case airflow and ambient temperature.

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