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

NEMIX RAM

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

SKU CH-ENPY-AF1VV

16 GB DDR4 2666 ECC unbuffered SODIMM for Synology NAS, CL19 1.2 V 2Rx8 260-pin

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • 16GB DDR4 2666 ECC protects data integrity in Synology NAS
  • CL19 latency at 1.2V balances speed with low power draw
  • 2Rx8 260-pin SODIMM fits DS3617xsII slots directly
  • Major OEM chips from Samsung Micron Hynix ensure reliability
  • Unbuffered ECC design adds error correction without registered overhead

16 GB DDR4 2666 ECC SODIMM for Synology NAS

This 16 GB module adds ECC-protected DDR4 memory to compatible Synology DiskStation units such as the DS3617xsII. It targets administrators who need error-correcting capacity for file services, virtualization or backup workloads. The unbuffered 2Rx8 design fits standard 260-pin SODIMM slots without requiring registered memory support.

Runs at 1.20 V with CL19 latency and no heat

Operating at the standard DDR4 1.20 V level, the module draws minimal power and generates little heat inside a densely populated NAS chassis. Absence of a heat spreader keeps the profile low for tight drive-bay clearances while CL19 timing delivers stable throughput at 2666 MT/s. Passive cooling in the enclosure is sufficient for normal sustained loads.

Single 16 GB stick leaves other slots free

The 1x16 GB configuration occupies one SODIMM slot, preserving remaining sockets for future capacity increases. Compatibility is validated for the listed Synology platform, so installation follows the manufacturer's upgrade procedure without BIOS changes. Builders needing higher density per slot or registered DIMMs should select a different module type.

How it compares

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

Price $115.99
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 $7.25 per GB
Cheaper than about 56% 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

How do I install this 260-pin DDR4 SODIMM in my Synology DS3617xsII and what step is often missed?

Power down the NAS, remove the cover, insert the module at an angle into the SODIMM slot until the gold contacts are hidden, then press firmly until the side clips click — the step most people miss is fully seating both clips so the ECC memory registers correctly.

What maintenance or replacement will this 16GB ECC Unbuffered module need over time?

No routine maintenance is required; the module has no heat spreader or moving parts, and ECC error correction handles single-bit errors transparently — replacement is only needed if a sustained multi-bit error appears in system logs.

What limit appears first when this CL19 2666MHz memory runs under sustained NAS workloads?

The CAS latency of CL19 at 1.20V sets the timing ceiling; under continuous heavy load the memory controller will hit latency-bound throughput before thermal or voltage limits become a factor.

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