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Four green DDR5 RDIMM modules, bare circuit boards with gold contacts, no heat spreaders

NEMIX RAM

NEMIX RAM 64GB (4x16GB) DDR5 4800 CL40 1Rx8 1.1V ECC RDIMM 288-Pin memory upgrade

SKU CH-ZAEJ-0CBT9

64 GB DDR5 ECC registered server kit with four 16 GB modules at 4800 MT/s CL40, 1.1 V, 288-pin, validated for Supermicro GPU SuperServer systems

  • Total capacity64 GB (4 × 16 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • ECC protection ensures data integrity for critical workloads
  • Registered design stabilises signal quality on dense server boards
  • 4800 MT/s DDR5 speed feeds high-throughput GPU servers
  • 1 V operation reduces power draw across 64 GB capacity
  • 4-module kit simplifies population of SuperMicro 421/821 platforms

64 GB DDR5 ECC RDIMM kit for Supermicro servers

This NEMIX RAM kit provides 64 GB of DDR5 memory across four 16 GB registered DIMMs. It targets administrators upgrading Supermicro GPU SuperServer platforms such as the SYS-821GE-TNHR, SYS-821GV-TNR and SYS-421GE-TNRT. The modules run at 4800 MT/s with CL40 latency and operate at 1.1 V. ECC and registered buffering protect data integrity in mission-critical workloads.

Fits DDR5 RDIMM slots on qualified Supermicro

Each 288-pin module installs directly into the server's registered DIMM sockets without additional hardware. The 1Rx8 organisation allows the memory controller to address the full capacity efficiently. Registered signalling reduces electrical load on the memory bus, freeing the platform to populate all available slots. No heat spreaders are fitted, so airflow in the chassis must be sufficient for bare modules.

Replaces slower or smaller DDR5 RDIMM configurations

The kit upgrades systems running lower-capacity or lower-speed registered DDR5 memory. The jump is worthwhile when workloads demand the full 64 GB at 4800 MT/s with ECC protection. It is not suited for builds that require unbuffered UDIMMs, non-ECC memory or speeds beyond the specified 4800 MT/s rating.

How it compares

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

Price $1,720.99
Pricier than about 66% of the 21,161 comparable items (median $397.99).
Total capacity 64 GB (4 × 16 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $26.89 per GB
Pricier than about 74% 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 numberMR38400-618K4
Total capacity64 GB (4 × 16 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 rank1Rx8
Power
Rated voltage1.1 V
Compatibility
Compatible systemsSupermicro
In the box
Included items64 GB (4 × 16 GB) DDR5 4800 MHz PC5-38400 1Rx8 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

Does the CL40 latency become a bottleneck when the 64GB kit runs at 4800 MT/s under sustained load?

CL40 is the rated CAS latency for these DDR5 4800 modules; the registered design adds one cycle of buffering, so the limit you hit first is the platform's maximum supported memory speed rather than the module latency itself.

What thermal or acoustic impact do the bare 288-pin RDIMMs add during continuous operation?

The modules have no heat spreader and draw 1.10 V; they rely on server chassis airflow, so noise and heat depend entirely on the system's fan profile, not the DIMMs themselves.

Which motherboard feature must already be present for this 288-pin ECC RDIMM kit to function?

The board must provide DDR5 RDIMM slots with registered ECC support; the kit is validated for Supermicro GPU SuperServer models including SYS-821GE-TNHR, SYS-821GV-TNR and SYS-421GE-TNRT.

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