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Green circuit board SODIMM module with black memory chips and gold edge connectors

NEMIX RAM

NEMIX RAM 8GB DDR4 2666 ECC SODIMM Synology DS1621

SKU CH-M78R-MJD8G

8 GB DDR4 ECC SODIMM running at 2666 MHz with CL19 latency for Synology DS1621 NAS

  • Total capacity8 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor OEM Samsung, Micron, Hynix
  • CAS latencyCL19
  • Buffer typeUnbuffered
  • Rated voltage1.2 V
  • ECC protection prevents data corruption in Synology DS1621 NAS
  • 8 GB DDR4 2666 MHz module expands system memory capacity
  • Low 1.2 V operation reduces power draw and heat output
  • Single-rank 1Rx8 layout with CL19 latency ensures stable throughput
  • 260-pin SODIMM form factor fits Synology DiskStation DS1621 slots

NEMIX RAM 8GB DDR4 2666 ECC SODIMM

This module is an 8 GB DDR4 2666 ECC unbuffered SODIMM built for Synology DiskStation DS1621 NAS units. It runs at 1.2 V with CL19 latency and uses a 260-pin form factor. The single-rank 1Rx8 design relies on major OEM chips from Samsung Micron or Hynix. It is sold new as a direct memory upgrade for that platform.

Suits DS1621 owners adding ECC capacity

The part fits administrators who need validated ECC memory for a Synology DS1621 and want a straightforward single-module installation. It does not suit users whose NAS requires registered DIMMs or a different pin count. Buyers without a compatible Synology model should look at memory matched to their specific hardware.

260-pin DDR4 ECC SODIMM decides fit

The 260-pin DDR4 ECC SODIMM interface is the single specification that determines whether this module will seat and function in the target NAS. Confirm the DS1621 slot type matches this exact format before purchasing. No other figure in the data overrides this compatibility requirement.

How it compares

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

Price $57.99
Cheaper than about 76% 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 $7.25 per GB
Cheaper than about 56% of the 20,941 comparable items (median $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 numberMSE21300-818K1
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

Will this 260-pin DDR4 2666 CL19 module work with the original memory already installed in my Synology DS1621?

Yes, it is built as an unbuffered ECC SODIMM at 1.20 V and CL19 to match the DS1621 memory controller, so it will run alongside the factory modules at the same speed and timing.

How can I verify the 8 GB stick is recognised and ECC is active after I install it in the DS1621?

Open DSM, go to Control Panel > Hardware & Power > General, and confirm the total memory shows the added 8 GB and the status line reports ECC enabled.

Does the package include only the SODIMM or are tools and thermal pads supplied as well?

The box contains the single 8 GB 260-pin DDR4 2666 ECC SODIMM (part MSE21300-818K1) and nothing else; no screwdriver, thermal pad or extra hardware is included.

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