Synology D4ECSO-2666-16G

Overview

The Synology D4ECSO-2666-16G is a 16 GB DDR4 SO-DIMM memory module designed specifically for Synology NAS devices. Running at 2666 MHz, it enhances system responsiveness during demanding tasks such as file indexing, photo management, and running multiple Docker containers. Equipped with ECC technology, this module helps maintain data integrity by detecting and correcting common memory errors, which is crucial for protecting backups, databases, and virtual machines.

Engineered by Synology for seamless compatibility, it supports models like the DS1621+, DS1819+, DS3018xs, and FS1018, allowing for easy installation and immediate recognition by the system. This upgrade is well suited for users who need to run multiple services simultaneously without performance slowdowns, making it a practical choice for small businesses and home power users alike.

Key features

• DDR4 memory running at 2666 MHz to improve multitasking and system responsiveness
• Error-Correcting Code (ECC) support to detect and fix memory errors, enhancing data reliability
• SO-DIMM form factor tailored to fit Synology NAS slots without modification
• Official qualification for several Synology NAS models ensures plug-and-play installation
• Dual-rank layout with a low profile design to avoid interference with internal components
• Unbuffered and non-registered design simplifies installation and compatibility
• Supports multitasking environments including virtual machines, media servers, and backup operations
• Operates in non-ECC mode on NAS models that do not support ECC, maintaining flexibility

Key specs

• Memory capacity: 16 GB
• Memory type: DDR4
• Speed: 2666 MHz
• Form factor: SO-DIMM
• ECC support: Yes (operates in non-ECC mode if unsupported by NAS)
• Layout: Dual-rank
• Compatibility: Synology NAS models including DS1621+, DS1819+, DS3018xs, FS1018
• Design: Unbuffered, non-registered

Compatibility and installation

This memory module is designed to integrate smoothly with supported Synology NAS models, which automatically recognize the module upon installation. Upgrading involves powering down the NAS, inserting the SO-DIMM into the designated slot, and powering the system back on. This straightforward process eliminates compatibility concerns often encountered with third-party RAM, ensuring a reliable upgrade path for expanding memory capacity.

Whether your NAS has a single memory slot or multiple slots available, this module provides a flexible solution to increase performance and stability. It is especially beneficial for setups that require running multiple applications or handling large data workloads simultaneously.

Ideal uses and environments

This memory upgrade fits well in environments where NAS devices handle intensive tasks such as hosting virtual machines, streaming 4K media, managing surveillance footage, or performing large backup jobs. Small businesses that depend on shared folders and real-time collaboration will benefit from faster document access and reduced lag during peak usage. Home users managing smart-home data and multimedia libraries will also find this module enhances overall system responsiveness and reliability.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Shipping costs are calculated at checkout based on destination, total weight, and selected speed. Free shipping applies to carts over $100 (excluding heavyweight items). All available options and final pricing are clearly shown before payment so you can choose the service that best fits your needs.

Deliveries are handled by major carriers such as USPS, UPS, and FedEx. Estimated delivery times are displayed at checkout and may vary depending on service level and location. Please note that these are estimates and can be affected by weather, holidays, or carrier volume. Once your order ships, you’ll receive a tracking number for real-time updates from pickup to final delivery.

Providing an accurate shipping address helps prevent delays, and changes may be limited once the order has been dispatched. P.O. boxes are supported only when permitted by the selected carrier. Packaging and handoff are optimized to protect items during transit, though oversized or high-weight products may require special handling. All shipping methods and any related constraints are clearly shown during checkout.

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Returns are accepted within 30 days of delivery. Items must be unused, in the same condition received, and include all tags, manuals, accessories, and original, unaltered packaging. To start a return, please email us for approval. Items sent back without approval may be refused or returned to the sender. If any item is kept, its value will be deducted from the refund.

Non-returnable items include opened TVs, combos, or monitors 37″ or larger, opened computers or software, electronic downloads, opened consumables (film, paper, bulbs, media, ink), custom or modified computers, special-order or “nonreturnable” items, submerged underwater gear, and opened educational media.

After inspection, refunds are issued to the original payment method. Please allow 5–7 business days for the credit to post. Shipping and handling are nonrefundable. If an item is used, incomplete, or not in its original condition, a 30% restocking fee may apply. Direct exchanges are not offered. To exchange an item, please purchase the replacement separately and return the original for a refund.

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We act solely as a reseller. Any product warranty is provided and administered by the manufacturer, not by our store. That means eligibility, coverage, and outcomes are determined by the manufacturer’s policy for each brand and model. Before purchasing, we recommend reviewing the warranty terms on the manufacturer’s website or in the product documentation to confirm what is covered and for how long.

If you need warranty service, please file the claim directly with the manufacturer. They may require proof of purchase, the product serial number, original packaging, photos, or basic troubleshooting. Some brands ask you to register the product or obtain a case number before shipping it for repair or replacement. We don’t submit or approve claims, but we can point you to the correct support links and contact details.

Keep your invoice and packaging in a safe place, and report any functional issues to the manufacturer as soon as they appear. If you’re unsure whether a problem is covered, the manufacturer’s support team can confirm next steps and timelines. While we cannot intervene in decisions or outcomes, we’re happy to provide purchase documentation or guidance so you can move through the warranty process smoothly.

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