We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
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

  • Capacity256GB (2 x 128GB)
  • SpeedDDR5 4800 (PC5 38400)
  • ECCYes
  • Buffered/RegisteredRegistered
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • Voltage1.10V
  • 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.

Highlights

  • 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

Specifications

BrandNEMIX RAM
SeriesSuperMicro Server/Workstation Compatible Series Memory
ModelSuperMicro DDR5 4800MHZ ECC RDIMM Registered Server Memory
Part NumberMR38400-744K2
Capacity256GB (2 x 128GB)
SpeedDDR5 4800 (PC5 38400)
ECCYes
Buffered/RegisteredRegistered
ChipsetMajor OEM Samsung, Micron, Hynix
Voltage1.10V
Compatible SystemSupermicro
CAS LatencyCL40
Heat SpreaderNo
Type288-Pin DDR5 RDIMM
Rank4Rx4
FeaturesDDR5 ECC Registered RDIMM Server Motherboard Compatible
Package Content256GB (2X128GB) DDR5 4800MHZ PC5-38400 4Rx4 1.1V 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.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.