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Timetec DDR4-2666 4GB Replacement for Synology D4NESO-2666-4G Non-ECC Unbuffered SODIMM (Compatible for RS820RP+, RS820+, DS920+, DS720+, DS420+, DS220+, DS2419+, DS2419+II, DS1819+, DVA3219, DS1618+)
Timetec

Timetec DDR4-2666 4GB Replacement for Synology D4NESO-2666-4G Non-ECC Unbuffered SODIMM

Bottom line: The Timetec DDR4-2666 4GB Replacement ($31.99 on Amazon as of 2026-10-06): Matches Synology D4NESO-2666-4G specs: DDR4-2666, CL19, 1.2V; main trade-off: only 4GB per stick; heavy VM or container loads may need more.

$31.99

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Buy on Amazon — $31.99 Compare to similar memory (ram)

By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014. For desktop and laptop memory upgrades, synthesises manufacturer specs and independent reviews rather than first-hand lab testing. Core beat: GPU performance across gaming, rendering, and local-LLM inference.

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

Pros & Cons

Pros

  • ✓ Matches Synology D4NESO-2666-4G specs: DDR4-2666, CL19, 1.2V
  • ✓ Named compatibility with 11 Synology models across the 18, 19 and 20 series
  • ✓ 260-pin unbuffered SODIMM, PC4-21300 rated
  • ✓ Guaranteed lifetime warranty from purchase date
  • ✓ Free US-based technical support from Timetec

Cons

  • ✗ Only 4GB per stick; heavy VM or container loads may need more
  • ✗ Non-ECC; not for setups that require ECC memory
  • ✗ Third-party module, not a Synology-branded part
  • ✗ CL19 timing is standard JEDEC-class, not low-latency

Manufacturer description

Want more memory in your Synology NAS without paying for the first-party module? The Timetec DDR4-2666 4GB SODIMM is a direct replacement for Synology's D4NESO-2666-4G. It matches the key specs: DDR4 2666MHz (PC4-21300), 260-pin, unbuffered non-ECC, 1.2V, CL19 and single rank 1Rx8, built on 512x8 chips. Timetec lists compatibility by model. From the 20 series, it fits the RS820RP+, RS820+, DS920+, DS720+, DS420+ and DS220+. From the 19 series, it fits the DS2419+, DS2419+II, DS1819+ and DVA3219. From the 18 series, it fits the DS1618+. If you run more packages, containers or virtual machines…

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SpecPicks Verdict

SpecPicks scored Timetec DDR4-2666 4GB Replacement using a rating × review-volume × price-fit model applied to published specs and reviews across the memory (ram) category. Timetec's memory (ram) lineup sits within the broader category mid-tier; price and specs are the deciding factors over brand loyalty here. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for memory (ram) of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

Which Synology NAS models does the Timetec 4GB DDR4-2666 SODIMM work with?

Timetec lists the RS820RP+, RS820+, DS920+, DS720+, DS420+ and DS220+ (20 series), the DS2419+, DS2419+II, DS1819+ and DVA3219 (19 series), and the DS1618+ (18 series).

Is this the same spec as the Synology D4NESO-2666-4G module?

It is sold as a replacement for the D4NESO-2666-4G and matches its listed specs: DDR4 2666MHz PC4-21300, 260-pin, unbuffered non-ECC, 1.2V, CL19 and single rank 1Rx8 on 512x8 chips.

Is this RAM ECC or non-ECC?

It is unbuffered non-ECC memory. If your system requires ECC modules, this stick is the wrong choice.

How much memory does one module add?

Each module is 4GB. The total you can install depends on your NAS model's slot count and maximum supported memory, so check Synology's specifications for your unit.

What warranty does Timetec offer on this SODIMM?

Timetec includes a guaranteed lifetime warranty from the purchase date, plus free technical support based in the United States.

Key Features

  • Replacement for Synology D4NESO-2666-4G SODIMM RAM (DDR4 2666MHz PC4-21300 260 Pin Unbuffered Non-ECC 1.2V CL19 Single Rank 1Rx8 based 512x8)
  • Compatible with 20 series: RS820RP+, RS820+, DS920+, DS720+, DS420+, DS220+
  • Compatible with 19 series: DS2419+, DS2419+II, DS1819+, DVA3219
  • Compatible with 18 series: DS1618+
  • Guaranteed Lifetime warranty from Purchase Date and Free technical support based on United States

Full Specifications

BrandTimetec
Weight4g
Voltage1.2 volts
RAM Size4 GB
Form FactorSO-DIMM
Memory Speed2666 MHz
Number of Pins260
Mfr Part Number7
Memory GenerationDDR4
Compatible DevicesLaptop, Server
Data Transfer Rate2100 megabytes_per_second
Memory Form FactorUDIMM
Additional FeaturesDDR4
Computer Memory Size4 GB
Warranty DescriptionLifetime
RAM Memory TechnologyDDR4
Compatible with 18 seriesDS1618+
Compatible with 19 seriesDS2419+, DS2419+II, DS1819+, DVA3219
Compatible with 20 seriesRS820RP+, RS820+, DS920+, DS720+, DS420+, DS220+
Column Address Strobe LatencyCL19
Full listing titleTimetec DDR4-2666 4GB Replacement for Synology D4NESO-2666-4G Non-ECC Unbuffered SODIMM (Compatible for RS820RP+, RS820+, DS920+, DS720+, DS420+, DS220+, DS2419+, DS2419+II, DS1819+, DVA3219, DS1618+)

Ready to buy?

Timetec DDR4-2666 4GB Replacement for Synology D4NESO-2666-4G Non-ECC Unbuffered SODIMM (Compatible for RS820RP+, RS820+, DS920+, DS720+, DS420+, DS220+, DS2419+, DS2419+II, DS1819+, DVA3219, DS1618+) is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

Buy on Amazon — $31.99

*Price sourced from Amazon.com. Last updated 2026-10-06. Price and availability subject to change.

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Timetec DDR4-2666 4GB Replacement for Synology D4NESO-2666-4G Non-ECC Unbuffered SODIMM (Compatible for RS820RP+, RS820+, DS920+, DS720+, DS420+, DS220+, DS2419+, DS2419+II, DS1819+, DVA3219, DS1618+)
$31.99
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