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Large rectangular E-ATX motherboard in matte black with silver heatsinks and TR4 socket visible

ASUS

ASUS PRIME X399-A AMD motherboard Socket TR4 DDR4 128GB E-ATX

SKU CH-Y249-XJ488

E-ATX motherboard with AMD X399 chipset and Socket TR4 supporting up to 128GB DDR4 memory

  • CPU Socket TypeSocket TR4
  • ChipsetAMD X399
  • Maximum Memory Supported128GB
  • Supports high-capacity DDR4 builds with 128GB maximum memory
  • TR4 socket ready for AMD X399 platform processors
  • E-ATX form factor provides extensive expansion space
  • Includes SATA cable and I/O shield for immediate setup
  • 100% inspected used board with CMOS battery installed

Socket TR4 platform for high-core-count CPUs

The ASUS PRIME X399-A is an E-ATX motherboard built around the AMD X399 chipset and the Socket TR4 interface. It targets workstations and enthusiasts who need many processing threads for rendering, simulation or virtualisation workloads.

128 GB DDR4 capacity with quad-channel headroom

Four memory slots support up to 128 GB of DDR4, giving ample headroom for large datasets and multi-VM environments. The quad-channel architecture delivers high bandwidth, while the 128 GB ceiling marks the practical limit for memory-heavy tasks.

Replaces older HEDT boards when thread count matters

Moving to this platform from earlier high-end desktop boards makes sense when a workload scales with core count and demands quad-channel memory. The jump is worth it for users who hit memory or thread limits on dual-channel systems.

Highlights

  • Supports high-capacity DDR4 builds with 128GB maximum memory
  • TR4 socket ready for AMD X399 platform processors
  • E-ATX form factor provides extensive expansion space
  • Includes SATA cable and I/O shield for immediate setup
  • 100% inspected used board with CMOS battery installed

Specifications

BrandASUS
SeriesASUS PRIME X399-A
ModelASUS PRIME X399-A
CPU Socket TypeSocket TR4
ChipsetAMD X399
Maximum Memory Supported128GB

Questions about this item

Will my existing DDR4 memory kits work with this X399 board up to the 128 GB limit?

The board supports DDR4 up to a total of 128 GB across its eight slots, so any standard DDR4 DIMMs you already own can be used within that capacity.

How can I confirm the motherboard posts correctly after installing a TR4 processor?

Power on the system and watch for the BIOS splash screen or listen for a single beep; the included I/O back panel lets you connect a monitor and keyboard immediately to verify video and input response.

What accessories ship with the board and what must I source separately?

The box contains the motherboard, a CMOS battery, one SATA cable and the chassis I/O back panel; you will need to provide a TR4 CPU, DDR4 memory, CPU cooler, power supply, storage drives and a case yourself.

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