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Green circuit board with black memory chips and gold edge connector

NEMIX RAM

NEMIX RAM 16GB DDR4 2666 ECC Unbuffered SODIMM CL19 1.2V 260-PIN memory upgrade

SKU CH-4PDZ-FWAYK

16 GB DDR4 2666 ECC SODIMM for Synology NAS, CL19 1.2 V 260-pin single module

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • ECC protection guards data integrity with DDR4 2666 CL19 operation
  • 16 GB capacity extends NAS workload headroom for Synology DS1621xs+
  • Unbuffered SODIMM installs directly into 260-pin laptop-style slots
  • 2 V DDR4 voltage reduces power draw under sustained load
  • Major-brand Samsung Micron Hynix chips deliver validated reliability

Synology NAS DDR4 ECC SODIMM

This 16 GB DDR4 2666 MHz ECC unbuffered SODIMM is built for Synology DiskStation DS1621xs+ systems that require error-correcting memory. It targets administrators and IT professionals who need validated reliability for continuous file serving and virtualization workloads.

Simple slot insertion with manual reference

Installation consists of inserting the 260-pin module into the NAS memory slot, a process that typically takes minutes. The main risk is mixing ECC unbuffered sticks with non-ECC or registered modules, which prevents boot or disables error correction. Always consult the Synology owner's manual for the exact slot population order.

16 GB 2Rx8 CL19 at 1.2 V

The single decisive specification is the 16 GB 2Rx8 organisation running at CL19 latency and 1.2 V. Systems that demand a different rank configuration, voltage or latency will not operate correctly with this module.

How it compares

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

Price $131.99
Cheaper than about 64% 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 $8.25 per GB
Typical for this category: the median of 20,941 items is $8.19 per GB.

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameNEMIX RAM
Product lineSynology Compatible Series NAS Memory
Model nameSynology DDR4 2666 MHz ECC Unbuffered SODIMM
Part numberMSE21300-628K1
Total capacity16 GB
Product type260-PIN DDR4 ECC SODIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor OEM Samsung, Micron, Hynix
Memory
CAS latencyCL19
ECC supportYes
Buffer typeUnbuffered
Heat spreaderNo
Memory rank2Rx8
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology
In the box
Included items16 GB (1 × 16 GB) DDR4 2666 MHz PC4-21300 2Rx8 1.2 V CL19 260-PIN ECC Unbuffered SODIMM

Questions about this item

How can I confirm the DDR4 2666 ECC SODIMM is running at the correct speed and latency after installation?

Enter the Synology DiskStation Manager, open the Hardware & Power section, and verify the memory information shows 2666 MHz and CL19 for the installed module.

What does the package contain and what additional parts are required for installation?

The box includes one 16 GB 260-pin DDR4 ECC unbuffered SODIMM; no extra components are needed — simply insert the module into an available slot on the compatible Synology NAS.

Which capacity and rank configuration should I choose for the Synology DS1621xs+?

This 16 GB 2Rx8 module matches the validated specification for the DS1621xs+; select this version when a single 16 GB ECC unbuffered SODIMM is required.

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