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Four green DDR5 RDIMM sticks with black chips, no heat spreaders

NEMIX RAM

NEMIX RAM 512GB (4x128GB) DDR5 6400MHz CL52 ECC RDIMM ASRock W890D8-2L2T memory upgrade

SKU CH-NARE-X6GD2

A 512 GB DDR5 ECC RDIMM kit of four 128 GB modules at 6400 MHz CL52, 1.1 V, 288-pin registered memory for the ASRock W890D8-2L2T motherboard

  • Total capacity512 GB (4 × 128 GB)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL52
  • Buffer typeRegistered
  • Rated voltage1.1 V
  • Memory rank4Rx4
  • 512 GB total capacity from four 128 GB modules
  • ECC registered design detects and corrects single-bit errors
  • DDR5 6400 MT/s speed with CL52 latency
  • Low 1.1 V operating voltage reduces power draw
  • Validated for ASRock Rack W890D8-2L2T motherboard

System-specific DDR5 kit

This 512GB kit consists of four 128GB DDR5 ECC RDIMM modules built for the ASRock Rack W890D8-2L2T motherboard. Registered buffering and on-die ECC target server and workstation workloads that require data integrity. The kit arrives new and ready for installation in compatible 288-pin slots.

512GB capacity at 6400MHz

Four quad-rank 4Rx4 modules deliver 512GB total capacity while operating at 6400MHz with CL52 latency. The 1.10V voltage supports dense memory configurations within typical server power envelopes. Workloads exceeding 512GB or requiring lower latency than CL52 will need a different solution.

Registered ECC RDIMM build

Each module uses a 288-pin DDR5 RDIMM form factor without a heat spreader, relying on chassis airflow for cooling. Registered signalling reduces electrical load on the memory controller when all four slots are populated. ECC capability corrects single-bit errors to maintain uptime in critical applications.

How it compares

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

Price $18,318.99
Pricier than about 91% of the 21,161 comparable items (median $397.99).
Total capacity 512 GB (4 × 128 GB)
Higher than about 90% of the 20,941 comparable items (median 32 GB).
Price per GB $35.78 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 numberMR51200-744K4
Total capacity512 GB (4 × 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 items512 GB (4 × 128 GB) DDR5 6400 MHz PC5-51200 4Rx4 1.1 V 288-PIN ECC RDIMM KIT

Questions about this item

Will the 6400MHz CL52 modules run alongside slower DDR5 DIMMs already installed in the ASRock W890D8-2L2T?

The kit operates at 6400MHz with CL52 latency; mixing speeds forces all DIMMs to run at the slowest installed module's frequency and timings.

How can I verify the 512GB 4Rx4 ECC RDIMM kit is recognised correctly after installation?

Check the BIOS memory information screen for 512GB total capacity, 6400MHz speed, ECC active status and four registered DIMMs detected.

Does the MR51200-744K4 package include only the four 128GB 288-pin DDR5 RDIMMs or are any extra items supplied?

The box contains exactly four 128GB DDR5 6400MHz CL52 1.1V 288-pin ECC RDIMM modules; no cables, brackets or additional hardware are included.

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