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Two bare green DDR5 RDIMM sticks with gold contacts and black label stickers

NEMIX RAM

NEMIX RAM 256GB (2x128GB) DDR5-6400 ECC RDIMM CL52 1.1V Kit for ASRock Rack GNR2D16-2T

SKU CH-7W65-81WGM

256 GB DDR5-6400 ECC registered RDIMM kit with two 128 GB modules at CL52 and 1.1 V, validated for the ASRock Rack GNR2D16-2T motherboard

  • Total capacity256 GB (2 × 128 GB)
  • Rated speedDDR5 6400 (PC5 51200)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL52
  • Rated voltage1.1 V
  • Buffer typeRegistered

Size 256GB 2X128GB

Show 4 more
  • 256 GB total capacity in a matched 2 x 128 GB kit
  • DDR5-6400 speed with CL52 latency for rated server performance
  • Registered ECC design corrects single-bit errors and stabilises fully populated slots
  • 1 V operation matches the board's memory-controller specification
  • 288-pin RDIMM form factor verified for ASRock Rack GNR2D16-2T

256GB DDR5-6400 ECC RDIMM kit

This 256GB kit contains two 128GB DDR5-6400 registered ECC RDIMMs built for the ASRock Rack GNR2D16-2T motherboard. Each module runs at 1.10V with CL52 latency and a 2Rx4 rank layout. The 288-pin registered design matches the board's memory controller requirements exactly. It is intended for administrators who need maximum supported capacity in a validated configuration.

Sustained load stability

Registered buffering reduces electrical load on the memory controller so all slots can run fully populated at the rated 6400MT/s speed without throttling. On-die ECC corrects single-bit errors in real time, preventing silent data corruption during long compute runs. The 1.10V operating voltage keeps power draw predictable under continuous utilisation. This combination maintains throughput and data integrity in multi-hour workloads.

Upgrade path and fitment check

The kit replaces lower-capacity RDIMMs or fills empty slots to reach the platform's 256GB limit in a two-module population. The jump is worthwhile when your workload exceeds current memory headroom or when ECC protection becomes a requirement. Verify the motherboard manual for approved DIMM population order and maximum capacity per slot before installation. It is not suitable for systems that accept only unbuffered UDIMMs or SODIMM form factors.

How it compares

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

Price $8,873.99
Pricier than about 86% 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 $34.66 per GB
Pricier than about 90% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineNEMIX RAM Original Series Server Memory
Model nameDDR5 ECC RDIMM Registered Server Memory
Part numberMR51200-724K2
Total capacity256 GB (2 × 128 GB)
Product type288-Pin DDR5 RDIMM
Performance
Rated speedDDR5 6400 (PC5 51200)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL52
ECC supportYes
Buffer typeRegistered
Memory rank2Rx4
Heat spreaderNo
Power
Rated voltage1.1 V
Compatibility
Compatible systemsASRock Rack
In the box
Included items256 GB 2 × 128 GB DDR5 6400 MHz PC5-51200 2Rx4 1.1 V 288-PIN ECC RDIMM KIT

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Questions about this item

How much power does the 256GB DDR5-6400 ECC RDIMM kit draw at its rated 1.1V?

Each module runs at 1.10V, the standard DDR5 operating voltage, keeping power draw low even when the server runs continuously at full 256GB capacity.

What motherboard slot and population rules does the ASRock Rack GNR2D16-2T require for this 2x128GB registered kit?

The board needs 288-pin DDR5 RDIMM slots and follows its own population order; consult the motherboard manual for the exact slot sequence before installing both 128GB modules.

Will the 2Rx4 registered ECC modules work alongside any existing RDIMMs already installed in the GNR2D16-2T?

Mixing ranks or capacities can break the memory controller's training; the board manual lists approved combinations, so verify the supported population rules before adding this 256GB kit to older DIMMs.

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