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Two green DDR5 RDIMM sticks with gold contacts and black heatspreaders

NEMIX RAM

NEMIX RAM 128GB (2 x 64GB) DDR5 6400MHz PC5-51200 2Rx4 1.1V 288-PIN ECC RDIMM server RAM

SKU CH-2R2F-Y8KSZ

A 128 GB DDR5 6400 MHz registered ECC server memory kit in two 64 GB modules with CL52 latency and 1.1 V operation

  • Total capacity128 GB (2 × 64 GB)
  • Rated speedDDR5 6400 (PC5 51200)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latency52
  • Rated voltage1.1 V
  • Buffer typeRegistered
  • 128 GB total capacity supports large virtualised workloads
  • DDR5 6400 MHz speed delivers high bandwidth for data-intensive tasks
  • ECC registered design corrects errors to protect critical server data
  • 1 V operation reduces power draw in dense memory configurations
  • 2Rx4 dual-rank organisation increases memory density per channel

Server DDR5 kit for registered ECC workloads

This 128GB kit provides two 64GB DDR5 RDIMMs rated at 6400MHz PC5-51200. Registered buffering and ECC protect data integrity in multi-socket servers. The 1.1V operating voltage matches the DDR5 baseline for registered modules. It is not compatible with standard desktop or laptop platforms.

Sustained throughput with registered buffering

The registered design places a register between the DRAM and the memory controller, reducing electrical load per channel during continuous operation. CAS latency of 52 cycles and the 2Rx4 organisation allow predictable timing across all ranks. ECC corrects single-bit errors without halting the pipeline under heavy sustained traffic.

DDR5 PC5-51200 interface limits

The PC5-51200 designation defines a 6400MT/s data rate ceiling for this module. Registered DIMMs require a server chipset and BIOS that implement the DDR5 RDIMM protocol; consumer platforms cannot initialise them. Capacity per module is fixed at 64GB in this 2Rx4 configuration.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $4,229.99
Pricier than about 90% of the 6,523 comparable items (median $188.99).
Total capacity 128 GB (2 × 64 GB)
Higher than about 90% of the 6,064 comparable items (median 32 GB).
CAS latency 52
Higher than about 90% of the 439 comparable items (median 40).
Price per GB $33.05 per GB
Pricier than about 90% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Model namePart#: MR51200-924K2-SM-AS-1015CS-TNR
Part numberPart#: MR51200-924K2-SM-AS-1015CS-TNR
Total capacity128 GB (2 × 64 GB)
Performance
Rated speedDDR5 6400 (PC5 51200)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latency52
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Power
Rated voltage1.1 V

Questions about this item

How much power does the 1.1V DDR5 6400 kit draw under sustained server loads?

Each module runs at 1.1V, the standard DDR5 operating voltage, so total power scales with the 128GB capacity and 6400MHz data rate rather than any elevated voltage.

What motherboard features are required for this 288‑pin ECC RDIMM kit to function?

The board must provide DDR5 RDIMM slots with registered ECC support and a memory controller rated for PC5‑51200 speeds.

Will this 2Rx4 registered kit work in a system that currently uses 1Rx8 DDR5 RDIMMs?

Mixing ranks is possible only if the platform’s memory controller and BIOS explicitly support heterogeneous rank configurations; otherwise the system may not train at 6400MHz.

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