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Two green DDR5 RDIMM modules with black chips, no heat spreader

NEMIX RAM

NEMIX RAM 256GB (2x128GB) DDR5 4800 ECC RDIMM CL40 1.1V 288-Pin memory upgrade

SKU CH-JGG1-EPXNG

A 256 GB DDR5 ECC registered server memory kit with two 128 GB modules running at 4800 MHz CL40 1.1 V for ASUS EPYC 9004 platforms

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • Massive 256GB capacity powers heavy multi-threaded workloads
  • DDR5 4800 speed delivers high bandwidth for data-intensive tasks
  • ECC registered design protects data integrity in mission-critical systems
  • Low 1.1V operation reduces power draw under sustained load
  • Validated for ASUS K14PA-U12 with 128-core AMD EPYC 9004 CPUs

256 GB DDR5 ECC RDIMM kit

This 256 GB kit contains two 128 GB DDR5 4800 registered DIMMs built for ASUS server motherboards such as the K14PA-U12. ECC and registered buffering protect data integrity in multi-socket EPYC 9004 platforms. The modules run at 1.1 V with CL40 latency. They are intended for administrators who need maximum capacity per channel in dense compute nodes.

288-pin registered modules without heat spreaders

Each stick uses a 4Rx4 organisation and major OEM DRAM from Samsung, Micron or Hynix. The bare PCB fits tight DIMM slots where tall heat spreaders would block airflow or adjacent components. Registered signalling reduces electrical load on the memory controller, allowing the full two-module population supported by the target board. Installation follows standard server DIMM procedure.

Low-voltage DDR5 operation at 1.1 V

The 1.10 V operating point keeps power draw modest for 256 GB of registered memory under sustained load. No on-board cooling is present, so chassis airflow must pass directly over the modules. In typical server deployments the registered design and ECC overhead add minimal latency while maintaining stability. Acoustic output depends entirely on system fan curves.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $7,086.99
Pricier than about 83% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (2 × 128 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $27.68 per GB
Pricier than about 77% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineASUS Server Motherboard Compatible Series Memory
Model nameASUS DDR5 4800 MHz ECC RDIMM Registered Server Memory
Part numberMR38400-744K2
Total capacity256 GB (2 × 128 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 4800 (PC5 38400)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL40
ECC supportYes
Buffer typeRegistered
Heat spreaderNo
Memory rank4Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsASUS
In the box
Included items256 GB (2 × 128 GB) DDR5 4800 MHz PC5-38400 4Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

What does the DDR5 4800 PC5-38400 standard mean for bandwidth?

DDR5 4800 PC5-38400 specifies the data rate and peak transfer rate for this registered ECC memory kit.

What physical slot and clearance does this 288-pin RDIMM kit require?

Each 128 GB module uses a standard 288-pin DDR5 RDIMM form factor with no heat spreader, so it fits any server DIMM slot wired for DDR5 registered memory.

How are these modules installed in the ASUS K14PA-U12, and what step is often missed?

Install both 128 GB RDIMMs in the correct channel slots per the motherboard manual, then verify the BIOS reports 256 GB at DDR5 4800 with ECC enabled.

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