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Two green DDR5 RDIMM modules, bare circuit boards with black chips, 288 pins each

NEMIX RAM

NEMIX RAM 256GB (2x128GB) DDR5 6400MHz CL52 1.1V 4Rx4 ECC RDIMM memory upgrade

SKU CH-54AM-0ZW3Y

Registered DDR5 ECC RDIMM kit delivering 256 GB across two 128 GB modules at 6400 MHz CL52 1.1 V for ASRock Rack W890D8-2L2T

  • Total capacity256 GB (2 × 128 GB)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL52
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • Memory rank4Rx4
  • 256 GB total capacity across two 128 GB modules
  • DDR5 6400 MHz speed with CL52 latency for responsive throughput
  • ECC registered design detects and corrects single-bit errors
  • 1 V operating voltage reduces power draw under load
  • Validated for ASRock Rack W890D8-2L2T motherboard compatibility

256GB DDR5 ECC RDIMM Kit

This 256GB kit contains two 128GB registered DDR5 modules built for server and workstation platforms that require error-correcting memory. It targets administrators upgrading an ASRock Rack W890D8-2L2T motherboard or any system validated for this exact part number.

Registered 4Rx4 Architecture at CL52

Each module uses a 4Rx4 organisation and runs at CL52 latency with a 1.10V operating voltage. The registered buffer and ECC functionality are mandatory for the target platform; systems expecting unbuffered or non-ECC DIMMs will not accept this kit.

256GB Total Capacity for Dense Workloads

The paired 128GB DIMMs deliver 256GB of addressable memory, supporting large virtualisation hosts, in-memory databases and heavy compilation jobs. Capacity ends at 256GB; configurations requiring more memory must populate additional slots with matching registered ECC modules.

How it compares

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

Price $8,808.99
Pricier than about 85% 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 $34.41 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 numberMR51200-744K2
Total capacity256 GB (2 × 128 GB)
Product type288-Pin DDR5 RDIMM
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL52
ECC supportYes
Buffer typeRegistered
Heat spreaderNo
Memory rank4Rx4
Power
Rated voltage1.1 V
Compatibility
Compatible systemsASRock
In the box
Included items256 GB (2 × 128 GB) DDR5 6400 MHz PC5-51200 4Rx4 1.1 V 288-PIN ECC RDIMM KIT

Questions about this item

What does the CL52 latency mean for real-world server responsiveness?

CL52 is the CAS latency at 6400 MT/s; lower cycles mean faster column access, so the registered ECC modules keep transactional workloads moving with minimal delay.

What does the PC5-51200 designation tell me about the memory interface?

PC5-51200 identifies DDR5-6400 operation; the registered DIMM interface caps at that transfer rate and the motherboard must support the same speed to realise it.

Will the 288-pin RDIMM kit fit the ASRock Rack W890D8-2L2T motherboard slots?

Yes, the 288-pin DDR5 RDIMM form factor matches the board's memory slots and the kit is validated for that specific model.

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