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Two green DDR4 RDIMM sticks, bare chips, no heat spreaders

NEMIX RAM

NEMIX RAM 64GB (2x32GB) DDR4 2666 CL19 ECC RDIMM memory upgrade

SKU CH-X1DM-R7565

64 GB DDR4 2666 ECC registered dual-rank kit (2 × 32 GB, 1.2 V, CL19, 288-pin) validated for ASRock Rack EPYCD8-2T motherboards

  • Total capacity64 GB (2 × 32 GB)
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V

Capacity 64GB 2X32GB

  • 64 GB capacity supports heavy server workloads
  • Dual 32 GB modules enable dual-channel throughput
  • DDR4 2666 speed matches platform specification
  • ECC registered design protects data integrity
  • 2 V operation reduces power draw

ASRock EPYCD8-2T DDR4 ECC Kit

This 64 GB kit contains two 32 GB registered DDR4 2666 modules built for ASRock Rack EPYCD8-2T series motherboards. It targets server and workstation administrators who need ECC RDIMM capacity for mission-critical workloads. The modules run at 1.2 V with CL19 latency and a 2Rx4 organisation. They provide a straightforward path to populating compatible DIMM slots with validated memory.

2Rx4 registered ECC modules

Each stick is a 288-pin RDIMM using major OEM Samsung, Micron or Hynix chips and includes on-die error correction. The registered buffer reduces electrical load on the memory controller, which helps stability in multi-DIMM server configurations. No heat spreader is fitted, so airflow across the PCB is unimpeded. The kit supplies exactly two modules to match the motherboard's channel population guidelines.

Tool-free DIMM installation

Installation follows standard server procedure: power down, open the chassis, align the notch on the 288-pin edge connector, and press until the retention clips engage. The most common issue is mixing registered ECC RDIMMs with unbuffered or non-ECC modules, which prevents the system from posting. Verifying that the BIOS recognises the full 64 GB at 2666 MT/s after the first boot confirms correct seating and compatibility.

How it compares

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

Price $356.99
Typical for this category: the median of 21,161 items is $397.99.
Total capacity 64 GB (2 × 32 GB)
Higher than about 60% of the 20,941 comparable items (median 32 GB).
Price per GB $5.58 per GB
Cheaper than about 69% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineASRock Server Motherboard Compatible Series Memory
Model nameASRock DDR4 2666 MHz ECC RDIMM Registered Server Memory
Part numberMR21300-324K2
Total capacity64 GB (2 × 32 GB)
Product type288-Pin DDR4 RDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Heat spreaderNo
Memory rank2Rx4
Power
Rated voltage1.2 V
Compatibility
Compatible systemsASRock
In the box
Included items64 GB (2 × 32 GB) DDR4 2666 MHz PC4-21300 2Rx4 1.2 V CL19 288-PIN ECC RDIMM Registered Server Memory KIT

Other versions of this model

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Questions about this item

Will the CL19 latency require any adjustment over time?

CL19 is a fixed timing value set by the module SPD; no maintenance or replacement is needed for latency.

What limits sustained throughput on these 2Rx4 modules?

The DDR4 2666 PC4-21300 interface caps continuous bandwidth at 21300 MB/s.

How much heat and power will the 1.20 V kit produce running all day?

Each 32 GB RDIMM operates at 1.20 V with no heat spreader; typical power stays within standard DDR4 registered DIMM limits.

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