This article covers Timetec DDR4-2666 4GB Synology D4NESO-2666-4G 非ECCアンバッファードSODIMM用交換用 (RS820RP+.

Overview

Timetec's D4NESO-2666-4G is a 4GB DDR4-2666 SODIMM memory module designed as a replacement for Synology NAS systems. Running at 2666MHz with CL19 timings at 1.2V, this unbuffered non-ECC stick uses a 260-pin SO-DIMM form factor. It's specifically validated for a range of Synology models including the DS920+, DS720+, and RS820+ from the 20-series, as well as several 19- and 18-series units. This single-rank module (1Rx8 based on 512x8) is a cost-effective way to boost NAS memory for file serving, backup, and light container workloads. With a price point around ¥8,500 on Japan, it offers substantial savings over official Synology RAM while delivering identical specifications.

Compatibility Guide

The Timetec D4NESO-2666-4G is explicitly compatible with the following Synology models: RS820RP+, RS820+, DS920+, DS720+, DS420+, DS220+ (20-series); DS2419+, DS2419+II, DS1819+, DVA3219 (19-series); DS1618+ (18-series). It is not compatible with other NAS brands or standard laptops. The module is DDR4-2666 (PC4-21300), 260-pin SO-DIMM, 1.2V, non-ECC, unbuffered. If your NAS already has RAM installed, ensure the new module matches the existing one in speed and rank configuration for optimal performance. Always check Synology's official compatibility list before purchasing.

Product Info

Released around 2021, this memory module is positioned as an affordable alternative to Synology's own D4NESO-2666-4G. It comes with a lifetime warranty from the date of purchase and free US-based technical support. Market positioning is entry-to-mid-range: it's ideal for home and small office NAS users who want to expand memory without paying premium prices. However, at 4GB it's modest for heavy virtualization or multiple Docker containers — consider 8GB modules if your NAS supports them.

Best Use Cases

Home file server user: Upgrading from 4GB to 8GB on a DS720+ noticeably improves responsiveness when multiple clients access files simultaneously. This module is a low-cost drop-in solution. Budget-conscious Synology owner: If you need a spare or replacement DIMM for a DS920+, this is significantly cheaper than the official Synology module while offering identical specs and compatibility. Non-intensive container user: Running a few Docker containers (e.g., Plex, Home Assistant) benefits from the extra headroom. However, for many containers or VM workloads, larger capacity is recommended. Not recommended for: Users requiring ECC memory, those with unsupported NAS models, or anyone needing more than 4GB per slot — in those cases, look for 8GB DDR4 SODIMMs from trusted brands.

Things to Consider

This module's compatibility is limited to the listed Synology models. Installing it in a non-listed model (e.g., DS218+) risks instability or failure. Also, some Synology units have specific firmware requirements; while this stick generally works, always verify via the Synology RAM compatibility page. Compared to generic DDR4 SODIMMs from Crucial or Kingston, the Timetec offers explicit Synology validation. The trade-off is a slightly higher price than unbranded sticks but much lower than official Synology RAM. Note that 4GB is the minimum useful upgrade — if your NAS can take 8GB modules, you may outgrow this size quickly. ## FAQ
Q: Can I use this memory in a standard laptop? A: No. This module is specifically programmed for Synology NAS systems and may not work in laptops. The SPD settings are tailored for Synology's platform. For laptop upgrades, use generic SODIMMs from Crucial or Kingston. Q: Can I install two of these in a DS920+ for 8GB total? A: Yes. The DS920+ supports up to 8GB (two 4GB sticks) and this module is designed to work in pairs. For best stability, use two modules from the same batch. Q: What is the warranty process for this module? A: The lifetime warranty covers manufacturing defects. Support is handled via email from the US. If a replacement is needed, you may be required to return the defective module first. Keep your proof of purchase.

Product Disclosure (Amazon)

  • Manufacturer: Timetec
  • Seller: ハッコーライフ
  • Fulfilled by: ハッコーライフ
  • ASIN: B098RJGGF4
  • Note: This article covers a manufacturer-made product based on Amazon listing details.