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Green circuit board SODIMM memory module with black chips, no heat spreader

NEMIX RAM

NEMIX RAM 16GB DDR4 2666 ECC Unbuffered SODIMM CL19 2Rx8 1.2V 260-pin Synology DS1621+ memory upgrade

SKU CH-TVFT-HZREX

16GB DDR4 2666 ECC SODIMM adds error-correcting memory to Synology DS1621+ NAS

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • ECC protection prevents data errors in critical NAS workloads
  • 16 GB capacity expands DS1621+ memory for heavier multitasking
  • 2666 MT/s DDR4 speed matches system bus for stable throughput
  • CL19 latency at 1.2 V balances responsiveness with low power draw
  • 260-pin SODIMM form factor fits Synology DiskStation DS1621+ slots directly

Synology DS1621+ 16GB ECC SODIMM

This 16GB DDR4 2666 module adds ECC protection to the Synology DiskStation DS1621+. It runs at 1.2V with CL19 timing and uses a 2Rx8 unbuffered layout. The 260-pin SODIMM form factor fits the NAS memory slots directly.

Single module ready for installation

The package contains one 16GB stick, so no pairing or matching is required. ECC circuitry corrects single-bit errors without needing registered buffering. Major-brand Samsung, Micron or Hynix chips are used depending on supply. No heat spreader is included, keeping the profile low for tight NAS bays.

Suits DS1621+ owners adding ECC capacity

Buyers who need registered DIMMs, non-ECC memory or a different pin count should look elsewhere. Systems that require 288-pin desktop modules or higher voltage operation are not compatible.

How it compares

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

Price $117.99
Cheaper than about 65% 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 $7.37 per GB
Cheaper than about 55% 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 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

Will the CL19 timing on this DDR4 2666 module need any adjustment or replacement over time?

No, the CL19 timing is fixed by the SPD and requires no adjustment; the module itself has no moving parts and is not a wear item.

What limit appears first when the DS1621+ runs this 16 GB 2Rx8 stick continuously?

The NAS CPU and memory-controller throughput ceiling is reached before the 2666 MT/s DIMM saturates.

How much heat and power does the 1.2 V unbuffered ECC SODIMM add during all-day operation?

It draws 1.2 V with no heat spreader, so thermal output is minimal and well within the DS1621+ cooling design.

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