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Two green 288-pin DDR5 RDIMM modules with black chips, no heat spreader

NEMIX RAM

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

SKU CH-MQBW-V5PDR

A 256GB DDR5 4800 ECC registered dual-rank kit with CL40 latency and 1.1V operation for 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 across two 128 GB modules
  • DDR5 4800 MT/s speed rated at PC5-38400
  • ECC registered RDIMM design protects data integrity
  • Low 1.10 V operating voltage reduces power draw
  • Validated for SuperMicro SuperServer SYS-221HE series systems

Capacity and compatibility

This 256 GB kit contains two 128 GB DDR5 modules built for Supermicro IOT SuperServer SYS‑221HE‑FTNR, SYS‑221HE‑FTNRD and SYS‑221HE‑TNR systems. It targets administrators who need registered ECC memory for mission‑critical workloads.

Installation notes

Modules are 288‑pin RDIMMs that seat in standard DDR5 server slots; the registered buffer adds electrical load, so the board must support 4Rx4 organisation. A common mistake is mixing these with unbuffered UDIMMs or using a platform that only accepts 1Rx8 or 2Rx4 ranks.

Deciding specification

The kit runs at DDR5 4800 with CL40 latency at 1.1 V, delivering PC5‑38400 bandwidth. If your server requires a different speed, voltage or rank configuration, this memory will not be compatible.

How it compares

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

Price $7,184.99
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 $28.07 per GB
Pricier than about 79% 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

How do I verify the kit is running at 4800 MT/s with CL40 after installation?

Enter the server BIOS or use a tool such as CPU-Z; the memory tab should show DDR5-4800 and a CAS latency of 40 for each 128 GB module.

What does the package contain and is anything else required?

The box includes two 128 GB 288-pin DDR5 RDIMM modules; no extra cables, brackets or software are needed for installation.

Which capacity version should I choose for a SuperMicro SYS-221HE-FTNR?

This 256 GB kit (2×128 GB) matches the supported 4Rx4 registered ECC configuration for that platform.

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