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Twelve bare green DDR5 RDIMM modules in a row

NEMIX RAM

NEMIX RAM 768GB (12x64GB) DDR5 4800 CL40 ECC RDIMM memory upgrade

SKU CH-B2RR-34GSK

768 GB of DDR5 ECC registered memory in a 12-module kit rated at 4800 MT/s CL40 for Supermicro servers

  • Total capacity768 GB (12 × 64 GB)
  • Rated speedDDR5 4800 (PC5 38400)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL40
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • Massive 768 GB capacity via twelve 64 GB modules
  • DDR5 4800 speed rated at PC5-38400 for high throughput
  • ECC registered RDIMM ensures data integrity under load
  • Low 1.10 V operation reduces server power draw
  • Validated for Supermicro SYS-121H-TNR SYS-221H-TNR SYS-221H-TN24R

768GB DDR5 ECC RDIMM kit for Supermicro servers

This 12-module kit delivers 768GB of DDR5 4800 registered ECC memory built for Supermicro Hyper SuperServer SYS-121H-TNR, SYS-221H-TNR and SYS-221H-TN24R platforms. Each 64GB module runs at 1.10V with CL40 latency and a 2Rx4 organisation. The registered design adds a buffer that stabilises heavy multi-channel workloads in enterprise environments.

Thermals power and noise in normal operation

Operating at the standard DDR5 voltage of 1.10V, the modules draw minimal power per DIMM and generate low heat without onboard spreaders. Passive cooling relies on chassis airflow directed across the 288-pin slots. Silent operation is inherent because no active cooling is attached to the memory itself.

Build integration and system impact

The kit fills twelve 288-pin DDR5 RDIMM slots and requires a motherboard qualified for registered ECC modules at 4800 MT/s. It is not suited for consumer desktop boards that lack ECC and registered support. Populating all channels maximises bandwidth for virtualisation and database tasks but leaves no free DIMM slots for future expansion.

How it compares

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

Price $20,122.99
Pricier than about 91% of the 21,161 comparable items (median $397.99).
Total capacity 768 GB (12 × 64 GB)
Higher than about 92% of the 20,941 comparable items (median 32 GB).
Price per GB $26.20 per GB
Pricier than about 72% 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 numberMR38400-924K12
Total capacity768 GB (12 × 64 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 rank2Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsSupermicro
In the box
Included items768 GB (12 × 64 GB) DDR5 4800 MHz PC5-38400 2Rx4 1.1 V CL40 288-PIN ECC RDIMM Registered Server Memory KIT

Questions about this item

How do I install the 12 DDR5 RDIMM modules into the SuperMicro SYS-121H-TNR and which step is often missed?

Power down the server, open the chassis, align each 288-pin module with its slot, press firmly until the ejectors click, then confirm all 12 are detected in BIOS before closing the case.

What maintenance will the 768GB DDR5 ECC registered kit require over its service life?

No routine maintenance is needed; keep the server air filters clean so the 1.1V modules stay cool, and rely on ECC to correct single-bit errors without intervention.

What limit appears first when the 12x64GB DDR5 4800 CL40 kit runs sustained workloads?

The memory controller's maximum supported capacity or thermal throttle point will be reached before the modules themselves hit a hard limit.

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