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Four green DDR5 RDIMM modules in a row

NEMIX RAM

NEMIX RAM 256GB (4x64GB) DDR5 6400MHz CL52 2Rx4 ECC Registered RDIMM memory upgrade

SKU CH-HD47-CA2PF

A 256GB DDR5 registered ECC kit of four 64GB modules running at 6400MHz CL52 1.1V, validated for the ASRock Rack GNRAPD12DNO motherboard

  • Total capacity256 GB (4 × 64 GB)
  • Rated speedDDR5 6400 (PC5 51200)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL52
  • Rated voltage1.1 V
  • Buffer typeRegistered

Size 256GB 4X64GB

Show 4 more
  • 256 GB total capacity in a four-module kit for maximum server density
  • DDR5 6400 MT/s speed with CL52 latency for high-throughput workloads
  • Registered ECC RDIMM design with 2Rx4 organisation for full-slot stability
  • 1 V operation reduces power draw in fully populated systems
  • Verified compatibility with ASRock Rack GNRAPD12DNO motherboard

Server Memory Kit

This NEMIX RAM kit delivers 256GB of DDR5 memory across four 64GB modules running at 6400MHz with CL52 latency. The registered ECC RDIMM design operates at 1.10V and uses a 2Rx4 rank configuration. It is built for the ASRock Rack GNRAPD12DNO motherboard where full-capacity population and error correction are required.

Suited for registered ECC platforms

The 288-pin registered form factor and ECC function suit servers that demand data integrity and stable operation with all slots filled. Systems needing unbuffered UDIMMs, non-ECC memory, SODIMM modules, or a different DDR generation will not accept this kit.

Build integration

Four modules populate the board's DDR5 RDIMM slots at the rated 6400MHz speed and 1.10V voltage. The registered architecture reduces electrical load on the memory controller when fully populated, while ECC corrects single-bit errors in flight. Verify the motherboard manual for approved population order and maximum supported capacity before installation.

How it compares

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

Price $9,007.99
Pricier than about 86% of the 21,161 comparable items (median $397.99).
Total capacity 256 GB (4 × 64 GB)
Higher than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $35.19 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 numberMR51200-924K4
Total capacity256 GB (4 × 64 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 4 × 64 GB DDR5 6400 MHz PC5-51200 2Rx4 1.1 V 288-PIN ECC RDIMM KIT

Other versions of this model

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Questions about this item

Must my ASRock Rack GNRAPD12DNO motherboard already support DDR5 6400 PC5-51200 registered ECC RDIMMs for this 256GB kit to work?

Yes — the board must accept 288-pin DDR5 RDIMMs at 6400 MT/s with registered ECC; this kit is spec-matched to that exact requirement.

Can I keep any existing DDR5 6400 registered ECC RDIMMs installed while adding these four 64GB 2Rx4 modules?

Only if the motherboard manual approves mixing 2Rx4 ranks in the same channel population; otherwise the board may not train at full 6400 speed.

How do I confirm the system sees all 256GB at DDR5 6400 CL52 1.1V after installation?

Enter BIOS or run a tool like dmidecode — each slot should show 64GB, 6400 MT/s, CL52, 1.1 V, registered ECC, 2Rx4 organisation.

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