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Two green DDR5 RDIMM sticks, no heat spreader, gold contacts visible

NEMIX RAM

NEMIX RAM 256GB (2x128GB) DDR5 4800 CL40 ECC RDIMM SuperMicro memory upgrade

SKU CH-CW98-54AEN

256 GB kit of two 128 GB DDR5 4800 CL40 ECC registered DIMMs validated for SuperMicro CloudDC SuperServer systems

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 256 GB total capacity from two 128 GB modules
  • DDR5 4800 MT/s speed rated at PC5-38400
  • ECC registered RDIMM for data integrity in servers
  • CL40 CAS latency at 1.1 V operating voltage
  • Qualified for SuperMicro CloudDC SuperServer SYS-621C-TN12R SYS-611C-TN4R SYS-121C-TN2R

Compatibility Check

Verify that your SuperMicro CloudDC SuperServer SYS-621C-TN12R SYS-611C-TN4R or SYS-121C-TN2R motherboard has twelve free 288-pin DDR5 RDIMM slots before ordering. The kit uses 4Rx4 registered modules that require a server chipset supporting registered ECC memory. Confirm the BIOS recognises 128 GB per DIMM and that the platform can address the full 256 GB capacity.

Build and Connectors

Each module is a bare 288-pin DDR5 RDIMM without a heat spreader, relying on chassis airflow for cooling. The registered design adds a buffer that stabilises the signal path in dense configurations. Gold-edge contacts resist oxidation during long-term deployment. The 1.1 V operating voltage matches the DDR5 server standard, reducing power draw per gigabyte.

Server Memory Kit

This NEMIX RAM kit provides 256 GB across two 128 GB DDR5 4800 CL40 ECC RDIMM modules built for SuperMicro CloudDC SuperServer platforms. Registered ECC operation detects and corrects single-bit errors to maintain data integrity in mission-critical workloads. Modules are stress-tested under load and assembled with major OEM DRAM from Samsung Micron or Hynix.

How it compares

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

Price $7,706.99
Pricier than about 84% 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 $30.11 per GB
Pricier than about 86% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineSuperMicro Server/Workstation Compatible Series Memory
Model nameSuperMicro 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 systemsSupermicro
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

Does the 256 GB kit include two 128 GB modules or must I buy a second kit?

The package contains two 128 GB modules, giving 256 GB in a single kit.

Should I choose the CL40 4800 MT/s version or a different speed for my SuperMicro server?

This kit is built to the DDR5 4800 CL40 specification that the listed SuperMicro CloudDC and SuperServer models require.

What does the 4800 MT/s rating deliver once the modules are installed in a SYS-621C-TN12R?

The modules run at 4800 MT/s with CL40 latency at 1.1 V, providing registered ECC bandwidth matched to the platform's memory controller.

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