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Sixteen green DDR5 RDIMM modules with gold contacts and black chips, no heat spreaders

NEMIX RAM

NEMIX RAM 256GB (16x16GB) DDR5 4800 CL40 1.1V ECC RDIMM SuperMicro Server memory upgrade

SKU CH-NMMG-DRE2J

256 GB kit of sixteen 16 GB DDR5 4800 CL40 ECC registered DIMMs at 1.1 V for SuperMicro Hyper SuperServer systems

  • Total capacity256 GB (16 × 16 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • 256 GB total capacity from 16 matched 16 GB modules
  • DDR5 4800 speed with CL40 latency for server workloads
  • ECC registered RDIMM design protects data integrity under load
  • 1 V operating voltage reduces power draw per module
  • Qualified for SuperMicro Hyper SuperServer SYS-121H-TNR, SYS-221H-TNR and SYS-221H-TN24R

256GB DDR5 ECC RDIMM kit

This 256GB kit contains sixteen 16GB DDR5 4800 ECC RDIMM modules. It is built for SuperMicro Hyper SuperServer systems including the SYS-121H-TNR, SYS-221H-TNR and SYS-221H-TN24R. The registered design and error-correcting code suit enterprise workloads that require data integrity.

DDR5 4800 CL40 1.1V registered limits

The modules run at DDR5 4800 (PC5-38400) with a CAS latency of 40 at 1.1V. Registered buffering adds one clock cycle of latency and the memory controller must support ECC RDIMM operation. Maximum capacity and population rules are defined by the server platform, not by the kit itself.

288-pin RDIMM installation notes

Each module uses the standard 288-pin DDR5 RDIMM form factor without a heat spreader. Align the key notch with the slot and press firmly until the latches click. Common issues include mixing registered with unbuffered DIMMs, exceeding the platform's supported rank count per channel, or leaving slots unpopulated in a required sequence.

How it compares

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

Price $6,942.99
Pricier than about 83% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (16 × 16 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $27.12 per GB
Pricier than about 75% 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 numberMR38400-618K16
Total capacity256 GB (16 × 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 items256 GB (16 × 16 GB) DDR5 4800 MHz PC5-38400 1Rx8 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory

Questions about this item

Should I pick the 16×16 GB kit or a smaller capacity for my SuperMicro server?

The 16×16 GB kit delivers 256 GB total and fills all 16 DIMM slots on the SYS-121H-TNR, SYS-221H-TNR or SYS-221H-TN24R; choose a smaller kit only if you need empty slots for future expansion.

What does the DDR5 4800 CL40 rating actually give me in these SuperMicro Hyper SuperServer systems?

The modules run at 4800 MT/s with CAS latency 40 at 1.1 V, providing the maximum JEDEC-standard throughput the platform supports without overclocking.

How does the 288-pin RDIMM interface limit performance on the SYS-121H-TNR and SYS-221H-TNR?

The registered 288-pin DDR5 RDIMM interface caps speed at the platform’s native 4800 MT/s and requires ECC registered modules; unbuffered or faster DIMMs will not operate.

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