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ATX motherboard in black and silver finish with AM4 socket and DDR4 slots

ASUS

ASUS ROG STRIX B550-A GAMING AMD motherboard

SKU CH-KYJ3-A6TDY

Socket AM4 ATX board with AMD B550 chipset supporting up to 128 GB DDR4 memory

  • CPU socketSocket AM4
  • ChipsetAMD B550
  • Max supported RAM128 GB
  • Supports up to 128GB DDR4 memory for heavy workloads
  • AMD B550 chipset enables modern platform features
  • Socket AM4 compatibility fits a wide processor range
  • ATX form factor suits standard desktop builds
  • Includes SATA cable and I/O shield for quick setup

AM4 Socket B550 Motherboard

This ASUS ROG STRIX board fits the AM4 socket and uses the AMD B550 chipset. It accepts DDR4 memory up to 128GB in an ATX layout. Builders needing that specific socket and chipset combination will find the core platform features covered.

Suits AM4 DDR4 builds; not for other sockets

The board suits anyone building or repairing an AM4 system that requires DDR4 support. Users with newer AM5 processors or older AM3+ chips must choose a different motherboard because the socket and memory generation are fixed by the hardware design.

128GB maximum memory capacity

The single specification that decides fit is the 128GB memory ceiling. If the planned workload needs more than 128GB of DDR4, this board cannot meet the requirement and another platform must be selected.

How it compares

Measured against everything we stock in Motherboards for AMD CPUs, at today’s prices. Recalculated every night.

Price $164.99
Cheaper than about 59% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Product lineASUS ROG STRIX B550-A GAMING
Model nameASUS ROG STRIX B550-A GAMING
Processor
CPU socketSocket AM4
ChipsetAMD B550
Memory
Max supported RAM128 GB

Questions about this item

What size case and power supply does the ATX ROG STRIX B550-A GAMING require?

The board follows the ATX form factor, so it needs a chassis with ATX mounting holes and an ATX power supply with a 24-pin connector plus an 8-pin CPU power plug.

Which screws and connectors must be seated first when installing the motherboard?

Fit the supplied I/O shield, lower the board onto the standoffs, secure all ATX mounting screws, then attach the 24-pin and 8-pin power cables before adding any expansion cards.

What replaceable item is already in the box for the board's real-time clock?

A CMOS battery is included in the package; swap it for a fresh coin cell when the system starts losing date and time settings.

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