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Green rectangular DDR4 SODIMM module with black chips and gold contacts

NEMIX RAM

NEMIX RAM 8GB DDR4 2666 ECC SODIMM Synology DS1821+

SKU CH-YH5N-MD1XM

8GB DDR4 2666 ECC SODIMM for Synology DS1821+ NAS, 1.2V CL19 unbuffered with Samsung, Micron or Hynix chips

  • Total capacity8 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • ECC protection guards data integrity in NAS workloads
  • DDR4 2666 speed matches Synology DS1821+ specifications
  • 2 V operation reduces power draw and heat
  • 260-pin SODIMM form factor fits NAS memory slots
  • 1Rx8 single-rank layout ensures broad compatibility

Synology DS1821+ ECC SODIMM Upgrade

This 8 GB DDR4 2666 ECC SODIMM is built for the Synology DiskStation DS1821+ NAS. It adds error-correcting memory to a system that relies on data integrity for file services and virtualization. The unbuffered 1Rx8 module installs in the single 260-pin slot without tools.

Thermals Power and Noise

The module runs at 1.2 V with no heat spreader, so it adds negligible heat to the NAS chassis. Passive cooling from the system fans keeps temperatures stable during sustained workloads. Power draw remains low because the unbuffered design avoids register overhead.

Non-ECC to ECC Migration

Replacing a non-ECC stick with this module enables single-bit error correction for the DS1821+. The jump is worth it when the NAS stores critical backups, runs Docker containers, or hosts virtual machines where silent data corruption is unacceptable. Builders who need more than 8 GB total capacity should verify the maximum supported memory before purchasing.

How it compares

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

Price $53.99
Cheaper than about 77% of the 21,161 comparable items (median $397.99).
Total capacity 8 GB
Lower than about 80% of the 20,941 comparable items (median 32 GB).
Price per GB $6.75 per GB
Cheaper than about 59% 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 numberMSE21300-818K1
Total capacity8 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 rank1Rx8
Power
Rated voltage1.2 V
Compatibility
Compatible systemsSynology
In the box
Included items8 GB (1 × 8 GB) DDR4 2666 MHz PC4-21300 1Rx8 1.2 V CL19 260-PIN ECC Unbuffered SODIMM

Questions about this item

How do I install this 260-pin DDR4 ECC SODIMM into my Synology DS1821+ and which step is often missed?

Power off the NAS and unplug it, open the chassis, align the notch on the module with the slot key, press firmly until the side clips click, then replace the cover before powering on; the step often missed is fully seating the module so both clips engage.

What maintenance or replacement will this 8GB DDR4 2666 ECC module need over time?

No scheduled maintenance is required; the module has no heat spreader and runs at 1.20V, so keep the NAS vents clean for airflow; replacement is only needed if a memory error appears or you expand capacity beyond the current 8GB.

What limit appears first when this CL19 1Rx8 ECC SODIMM runs sustained workloads on the DS1821+?

The CAS latency of CL19 at 2666 MT/s sets the access timing ceiling; under continuous heavy use the memory controller will hit that latency bound before thermal throttling occurs on the unbuffered chips.

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