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Green DDR4 RDIMM circuit board with black chips and gold edge connector

NEMIX RAM

NEMIX RAM 16GB DDR4 2666 CL19 1.2V 288-Pin ECC RDIMM Synology Compatible Memory Upgrade

SKU CH-J3T7-8WGP4

16 GB DDR4 ECC registered DIMM running at 2666 MHz with CL19 latency for Synology NAS systems

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V
  • 16 GB capacity expands Synology NAS storage headroom
  • DDR4 2666 speed matches system bus for stable throughput
  • ECC registered design detects and corrects data errors
  • 2 V operation reduces power draw and heat
  • 288-pin RDIMM form factor fits Synology FlashStation DIMM slots

Synology DDR4 ECC RDIMM

This 16 GB DDR4 2666 module is built for Synology FlashStation NAS units that require registered ECC memory. It delivers 1.2 V operation with CL19 latency in a single 288-pin RDIMM. IT administrators upgrading compatible systems gain error correction and registered buffering for data integrity.

Thermals noise and power

The module runs at the standard DDR4 voltage of 1.20 V without a heat spreader, relying on chassis airflow for cooling. Registered buffering reduces electrical load on the memory controller during normal NAS workloads. Silent solid-state operation adds no audible noise to the rack environment.

Sustained load behaviour

Under continuous read and write cycles the ECC logic corrects single-bit errors while the 2Rx4 organisation maintains signal stability across ranks. Stress-tested modules preserve throughput without throttling during extended backup or virtualization tasks. Compatibility validation targets the Synology D4RD-2666-16G specification for reliable long-term service.

How it compares

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

Price $109.99
Cheaper than about 66% of the 21,161 comparable items (median $397.99).
Total capacity 16 GB
Lower than about 70% of the 20,941 comparable items (median 32 GB).
Price per GB $6.87 per GB
Cheaper than about 58% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameNEMIX RAM
Product lineSynology Compatible Series NAS Memory
Model nameSynology DDR4 2666 MHz ECC RDIMM Registered Server Memory
Part numberMR21300-628K1
Total capacity16 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 systemsSynology
In the box
Included items16 GB (1 × 16 GB) DDR4 2666 MHz PC4-21300 2Rx4 1.2 V CL19 288-PIN ECC RDIMM Registered Server Memory

Questions about this item

How do I install this 288-Pin DDR4 RDIMM in my Synology NAS, and what step is often missed?

Power down the NAS, open the chassis, align the notch on the 288-Pin module with the slot key, press firmly until both retention clips click, then verify the new 16GB capacity in DSM before closing the case.

What maintenance or replacement will this ECC Registered module need over time?

No scheduled maintenance is required; the module either runs reliably for the system's life or is replaced under the lifetime warranty if a memory error appears.

What limit appears first when this CL19 1.20V kit runs sustained workloads?

The DDR4 2666 bandwidth ceiling is reached before thermal throttling, since the module has no heat spreader and operates at standard 1.20V.

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