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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 memory upgrade

SKU CH-PNFX-NHA0F

Adds 256GB of DDR5 4800 ECC registered memory in a dual 128GB kit for compatible Supermicro servers

  • 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 speed rated at PC5-38400
  • ECC registered design for data integrity
  • 10 V operating voltage for efficient power use
  • Qualified for Supermicro FatTwin SuperServer SYS-F521E3-RTB SYS-F511E2-RT X13SEFR-A

Server-grade DDR5 ECC RDIMM kit

This 256 GB kit contains two 128 GB DDR5 4800 registered DIMMs with ECC and a CL40 latency. Modules run at 1.1 V and use a 288-pin layout with 4Rx4 organisation. Designed for Supermicro FatTwin SuperServer SYS-F521E3-RTB and SYS-F511E2-RT platforms.

Compatibility limits

Suitable for administrators upgrading the named Supermicro FatTwin systems with validated ECC registered memory. Not for desktop PCs, workstations or laptops that require unbuffered non-ECC modules or a different pin-out.

DDR5 4800 registered ECC specification

The decisive spec is DDR5 4800 (PC5-38400) registered ECC RDIMM at 1.1 V with CL40 timing. Only systems that explicitly support this exact registered DDR5 standard and the Supermicro FatTwin models listed will accept the kit.

How it compares

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

Price $8,236.99
Pricier than about 85% 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 $32.18 per GB
Pricier than about 90% 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 this 288-pin DDR5 RDIMM fit a standard server DIMM slot?

Yes, the 288-pin DDR5 RDIMM form factor matches standard DDR5 registered DIMM slots used in compatible Supermicro systems.

What is the correct way to install the two 128GB modules in a Supermicro FatTwin node?

Install both modules in the same memory channel pair as specified in the Supermicro SYS-F521E3-RTB or SYS-F511E2-RT manual; mixing channels can prevent the 256GB kit from being recognised.

Will the Samsung, Micron or Hynix chips on these modules need active cooling later?

The modules ship without a heat spreader; ensure the server chassis provides adequate airflow over the DIMM slots to maintain stable operation at 1.10V.

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