Synology D4RD-2666-16G

Overview

The Synology D4RD-2666-16G is a 16GB DDR4 registered DIMM memory module designed to enhance the performance of select Synology NAS models such as the FS6400, FS3400, and SA3400. Operating at 2666 MHz, it delivers faster data processing and improved system responsiveness. Equipped with ECC technology, this module helps maintain data integrity by detecting and correcting memory errors automatically, which is crucial for reliable NAS operation under heavy workloads.

Its 288-pin design and low 1.2V power consumption make it an efficient upgrade that balances performance with energy savings. This memory module is ideal for users handling large files, running multiple applications, or seeking to minimize system delays in both professional and home server environments.

Key features

• 16GB DDR4 memory tailored for Synology NAS systems to ensure compatibility and stability
• 2666 MHz speed that enhances data access times and overall system responsiveness
• Error-correcting code (ECC) support that automatically detects and fixes common memory errors to protect data accuracy
• Registered DIMM (RDIMM) format with 288 pins for reliable and consistent performance in server environments
• Low voltage operation at 1.2V to reduce power consumption without sacrificing speed
• Designed specifically for Synology FS6400, FS3400, and SA3400 models, ensuring seamless integration

Key specs

• Memory capacity: 16 GB
• Memory type: DDR4 RDIMM
• Speed: 2666 MHz
• Pin count: 288 pins
• Voltage: 1.2 V
• ECC support: Yes
• Compatible models: Synology FS6400, FS3400, SA3400

Compatibility and installation

This memory module is designed to work exclusively with specific Synology NAS models, ensuring optimal performance and stability. For best results, it is recommended to install memory modules of the same size and speed together. The registered DIMM format supports server-grade reliability, making it suitable for environments where data integrity and uptime are critical.

Installation is straightforward for users familiar with NAS hardware upgrades, and the module’s low power requirements help maintain efficient operation without increasing energy costs significantly.

Who should consider this memory upgrade

This Synology 16GB DDR4 2666 MHz RDIMM is a strong choice for IT professionals and home server users who need to boost their NAS performance for demanding tasks such as large file transfers, virtualization, or running multiple simultaneous applications. It fits well in setups where data accuracy and system stability are priorities, helping to reduce delays and maintain smooth operation under heavy workloads.

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.

Learn more

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.

Learn more

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.

Learn more