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Four green DDR5 RDIMM modules in a row

NEMIX RAM

NEMIX RAM DDR5 ECC RDIMM 128GB 4x32GB 6400MHz CL52 1.1V 1Rx4 Registered ASRock Rack GNRAPD12DNO memory upgrade

SKU CH-55J9-A5EAS

128 GB DDR5 ECC registered kit in four 32 GB modules at 6400 MHz CL52 1.1 V for the ASRock Rack GNRAPD12DNO motherboard

  • Total capacity128 GB (4 × 32 GB)
  • Rated speedDDR5 6400 (PC5 51200)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL52
  • Rated voltage1.1 V
  • Buffer typeRegistered

Size 128GB 4X32GB

Show 4 more
  • 128 GB total capacity in a matched 4 × 32 GB kit
  • DDR5-6400 (PC5-51200) speed with CL52 latency at 1.1 V
  • Registered ECC RDIMM design for multi-slot stability and error correction
  • 1Rx4 rank organisation and 288-pin form factor built for ASRock Rack GNRAPD12DNO
  • Major OEM chips from Samsung, Micron or Hynix ensure enterprise-grade reliability

Exact-Match Server Upgrade

This 128GB kit contains four 32GB DDR5 RDIMMs rated at 6400MHz PC5-51200 with CL52 latency and 1.1V operation. It is built specifically for the ASRock Rack GNRAPD12DNO motherboard and uses a 1Rx4 registered ECC layout that the board's memory controller expects.

Build Integration Requirements

The modules use the 288-pin RDIMM form factor required by the target motherboard and will not fit UDIMM or SODIMM slots. Registered buffering reduces electrical load on the memory controller, allowing all four slots to be populated at full rated capacity. ECC functionality corrects single-bit errors automatically to protect data integrity.

Sustained Load Behaviour

Registered architecture maintains signal integrity when every slot is filled, keeping the kit stable at its rated 6400MHz speed under continuous workloads. ECC error correction operates continuously to prevent silent data corruption during extended compute tasks. The 1.1V operating voltage supports consistent efficiency without thermal throttling.

How it compares

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

Price $5,188.99
Pricier than about 80% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB (4 × 32 GB)
Higher than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $40.54 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 numberMR51200-314K4
Total capacity128 GB (4 × 32 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 rank1Rx4
Heat spreaderNo
Power
Rated voltage1.1 V
Compatibility
Compatible systemsASRock Rack
In the box
Included items128 GB 4 × 32 GB DDR5 6400 MHz PC5-51200 1Rx4 1.1 V 288-PIN ECC RDIMM KIT

Other versions of this model

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Questions about this item

What is the maximum memory speed this kit can sustain on the ASRock Rack GNRAPD12DNO?

The kit runs at DDR5 6400 (PC5 51200) with CL52 latency at 1.10V, matching the board's rated specification for full-capacity operation.

How much heat and power do four registered DIMMs add in a server running continuously?

Each module operates at 1.1V without a heat spreader; registered architecture reduces electrical load on the memory controller during sustained full-population use.

Which motherboard slot type and population rule must the ASRock Rack GNRAPD12DNO already have for this 4 x 32GB kit to work?

The board needs four 288-pin DDR5 RDIMM slots and must support 1Rx4 registered ECC modules populated per its memory-population guide for 128GB total capacity.

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