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Black ATX motherboard with silver heatsinks and ROG branding

ASUS

ASUS ROG STRIX B550-E GAMING AMD motherboard 128GB DDR4 ATX

SKU CH-PH4M-XFNS0

ATX motherboard with AMD B550 chipset, Socket AM4, supporting 128GB DDR4, ROG Strix B550-E Gaming series

  • CPU socketSocket AM4
  • ChipsetAMD B550
  • Max supported RAM128 GB
  • Supports up to 128GB DDR4 memory capacity
  • AMD B550 chipset for modern platform features
  • Socket AM4 fits compatible AMD processors
  • ATX form factor suits standard desktop cases
  • Includes SATA cable and I/O back panel

ROG STRIX B550-E GAMING AMD Motherboard

This ATX board pairs the AMD B550 chipset with a Socket AM4 CPU interface for mainstream desktop builds. It targets enthusiasts who want ROG Strix features and 128 GB DDR4 headroom in a standard form factor. The layout suits gaming rigs and productivity systems alike. No proprietary power connectors are required beyond normal ATX and EPS plugs.

128 GB DDR4 capacity and headroom

Four DIMM slots accept up to 128 GB of DDR4 memory, giving ample room for heavy multitasking and content-creation workloads. Populating all four slots at high frequencies may require manual tuning or lower speeds. The board runs out of memory capacity only when a workload exceeds the 128 GB ceiling. Two DIMMs are the sweet spot for stability at rated XMP profiles.

Build quality and daily connectivity

Reinforced PCIe slots and metal-reinforced I/O shield survive repeated GPU swaps and case moves. The supplied SATA cable and rear I/O panel cover basic storage and peripheral hook-up without extra purchases. A bundled CMOS battery keeps firmware settings alive through power cycles. Wi-Fi antenna is included only if the specific unit integrates a Wi-Fi module.

How it compares

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

Price $326.99
Pricier than about 58% of the 1,906 comparable items (median $224.49).

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Specifications

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

Questions about this item

Will the 128GB DDR4 limit still apply if I keep my older AM4 CPU?

The board supports up to 128GB of DDR4 regardless of which AM4 processor is installed, so your existing CPU will not lower that ceiling.

How can I confirm the board is working after I install it?

Power on the system; if the CMOS battery holds settings and the I/O back panel shows video and USB activity, the motherboard is functioning.

The box lists one SATA cable and a CMOS battery — do I need to buy any other cables or brackets?

Only the motherboard, one SATA cable, one CMOS battery and the I/O back panel are included; any additional SATA cables, M.2 screws or fan splitters must be purchased separately.

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