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Synology

Synology SODIMM ECC RAM DDR4-2666 16GB (D4ECSO-2666-16G)

  • Based on 66 reviews
Condition: New
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Availability: Only 2 left in stock, order soon!
Fulfilled by Provantage LLC
Arrives Jun 14 – Jun 16
Order within 13 hours and 50 minutes
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Style: 16GB


Features

  • Synology RAM DDR4-2666 ECC SO-DIMM 16GB
  • Compatibility - Applied Models: 21 series: RS1221RP+, RS1221+, DS1821+, DS1621xs+, DS1621+, DVA3221; 20 series: RS820RP+ (does not support the ECC feature, regardless of whether the expansion memory is ECC or non-ECC); 19 series: DS2419+, DS1819+; 18 series: DS3018xs, DS1618+; 17 series: DS3617xs

Description

Always select authentic Synology memory modules for optimum compatibility and reliability. Installation of non-Synology memory modules can lead to system instability or boot failures. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion. For more information on memory upgrade limitations, visit Synology website.

Brand: Synology


Computer Memory Size: 16 GB


RAM Memory Technology: DDR4


Memory Speed: 3200 MT/s


Compatible Devices: Synology devices


RAM Memory Technology: DDR4


Memory Speed: 3200 MT/s


Compatible Devices: Synology devices


Additional Features: Built and designed for maximum performance and reliability in Synology devices


Voltage: 1.2 Volts


Form Factor: SO-DIMM


Data Transfer Rate: 12 Gigabits Per Second


Number of Pins: 260


Memory Form Factor: SODIMM


Memory Generation: DDR4


RAM Size: 16 GB


Brand: Synology


Model Name: D4ECSO-2666-16G


UPC: 846504003679


Manufacturer: Synology


Model Number: D4ECSO-2666-16G


Mfr Part Number: D4ECSO-2666-16G


Warranty Description: 5 Years


Global Trade Identification Number: 79, 76


Unit Count: 1.0 Count


Item Weight: 1.12 ounces


Built-In Media: Synology 16GB DDR4 2666MHz ECC SO-DIMM Memory Module


Item Type Name: RAM Module


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Jun 14 – Jun 16

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Original parts
Style: 8GB
Great item, works just fine.
Reviewed in the United States on January 30, 2026 by Elad
    • Real Synology RAM Real Synology RAM
Style: 16GB
Review Image by Michael
People leave negative reviews on here due to the price tag. I get it. You CAN buy cheaper RAM. However, doing so voids your Synology Warranty. They don't hide that. If you don't like the price of their RAM, then either don't buy a Synology or go into that purchase knowing you plan to void the warranty. Don't come leave a negative review because you don't like the price. The product arrived exactly as advertised: Real, legitimate (see photo) Synology RAM. Maybe the other reviewer purchased from someone else, I'm really not sure. Installation is a breeze. I put this into my new DS 1621+ by moving the original 4G Stick to Bank B and installing the new 16G Stick into Bank A. Booted right up without any issues and a cool 20G of RAM in the system now. ... show more
Reviewed in the United States on February 12, 2021 Reviewed in the United States on February 12, 2021 by Michael
    • Synology product
Style: 16GB
Everything was ok.
Reviewed in the United States on June 28, 2025 by Fernando Moreno Julio
    • stupid expensive RAM that works
Style: 8GB
Stupid expensive RAM but worked where others failed, I tried 2 different brands and only this one worked on my 2024 Synology . minus a star for stupid price....
Reviewed in the United States on December 26, 2025 by BenAtFLA
    • Memory and it works
Style: 4GB
It worked just fine. Plug and play with synology nas
Reviewed in the United States on July 3, 2024 by Amazon Customer
    • Works great in Synology DS1821+
Style: 16GB
Purchased a pair of these to upgrade the RAM in a Synology DS1821+. These are working as advertised, and as they are on Synology's supported device list for the model I know they will not cause warranty issues should something happen later.
Reviewed in the United States on May 24, 2022 by DBJ
    • Good to have
Style: 8GB
Very nice working RAM
Reviewed in the United States on January 26, 2022 by stanislav
    • Caused NAS lockup
Style: 4GB
I bought this along with a new 720+ unit- paid extra to get one certified to work. Installed this RAM and my old drives and powered up, but the NAS was not discoverable. It took some back & forth with support before I tried removing this RAM, then everything came up and worked as expected. I will try getting another one to replace this. ... show more
Reviewed in the United States on April 2, 2021 by fred

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