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Green rectangular circuit board with gold edge connectors and black memory chips

NEMIX RAM

NEMIX RAM 16GB DDR4 2666 ECC RDIMM 1Rx4 CL19 1.2V 288-pin Synology FS6400 memory upgrade

SKU CH-8MZD-1T9AX

ECC registered DDR4 module adds 16 GB at 2666 MHz CL19 for Synology FS6400 NAS

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeRegistered
  • Rated voltage1.2 V
  • ECC protection prevents data corruption in Synology FS6400
  • Registered design stabilises signal integrity for server workloads
  • 16 GB capacity expands NAS memory headroom
  • DDR4 2666 speed matches FS6400 specifications
  • 2 V operation reduces power draw and heat

16 GB DDR4 2666 ECC RDIMM for Synology FS6400

This 16 GB registered DDR4 module runs at 2666 MHz with CL19 latency and 1.2 V operation. It is built specifically for the Synology FlashStation FS6400 NAS and uses ECC RDIMM technology for data integrity in server workloads.

Compatibility checklist for the FS6400

Verify that your FS6400 has an available 288-pin DDR4 RDIMM slot and that the system firmware supports registered ECC modules at PC4-21300 speed. The unit requires 1Rx4 organisation and 1.20 V power; mixing with unbuffered or non-ECC DIMMs is not supported.

Build and daily handling

The module has no heat spreader, so airflow across the board is the primary cooling path in the NAS chassis. Its 288-pin registered edge connector seats firmly in the server DIMM socket, and the 1Rx4 layout keeps signal loading low for stable long-term operation.

How it compares

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

Price $98.99
Cheaper than about 68% 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 $6.19 per GB
Cheaper than about 63% 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 numberMR21300-614K1
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 rank1Rx4
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology
In the box
Included items16 GB (1 × 16 GB) DDR4 2666 MHz PC4-21300 1Rx4 1.2 V CL19 288-PIN ECC RDIMM Registered Server Memory

Questions about this item

What comes in the box and do I need any extra parts to install this in my Synology FS6400?

The package contains a single 16 GB DDR4 2666 ECC RDIMM module. No additional components are required for installation in the compatible NAS.

Should I choose the 1Rx4 rank version or a different rank for the FS6400?

This module uses a 1Rx4 organisation, which matches the specification validated for the Synology FlashStation FS6400.

What does the PC4-21300 rating mean for real-world throughput in the NAS?

PC4-21300 indicates a peak transfer rate of 21 300 MB/s at 2666 MT/s, giving the FS6400 the rated bandwidth for ECC registered workloads.

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