Description

The Synology D4ECSO-2666-16G is a 16GB DDR4 ECC SO-DIMM memory module designed specifically for select Synology NAS systems. It offers high-speed performance, system stability, and data integrity—ideal for demanding environments like file servers, virtualization hosts, and backup storage.

Key Specifications

• Memory Type: DDR4 ECC Unbuffered SODIMM
• Capacity: 16GB
• Speed: 2666MHz (PC4-21300)
• Form Factor: 260-pin SODIMM
• Voltage: 1.2V
• CAS Latency: CL19
• Rank: Dual Rank (2Rx8)
• Error Correction: ECC (Error-Correcting Code)

Performance & Reliability

• Designed for 24/7 environments like file servers, virtualization hosts, and backup storage systems
• ECC memory helps detect and correct single-bit errors, reducing data corruption risks
• Engineered for system stability, faster file transfers, and smoother multitasking

Compatibility

This module is designed as a direct replacement for Synology’s D4ECSO-2666-16G and is compatible with a wide range of Synology NAS models, including:

• 22 Series: DS1522+, DS2422+, DS3622xs+, RS822+, RS822RP+
• 21 Series: RS1221RP+, RS1221+, DS1821+, DS1621xs+, DS1621+, DVA3221
• 20 Series: RS820RP+, RS820+
• 19 Series: DS2419+, DS2419+II, DS1819+, DVA3219
• 18 Series: DS3018xs, DS1618+
• 17 Series: DS3617xs, DS3617xsII
• FS Series: FS1018

• Optimized for Synology NAS: Fully compatible with a wide range of Synology models including DS1821+, DS1621+, FS1018, RS1221+, and more.
• Genuine Synology Module: Ensures maximum compatibility and avoids issues like system instability or boot failures that can occur with third-party memory

Note: Do not mix ECC and non-ECC SODIMM RAM I RS820+/RS820RP+ do not support ECC functionality, even if ECC memory is installed

Technical Benefits

• ECC (Error-Correcting Code): Automatically detects and corrects memory errors, improving data integrity and system reliability—especially important for mission-critical NAS operations.
• Unbuffered SO-DIMM: Offers lower latency and is ideal for systems that don’t require registered memory, making it suitable for small to mid-sized NAS setups.
• DDR4 2666 MHz Speed: Provides fast data transfer rates, enhancing overall system performance and responsiveness.

 Reliability

• ECC (Error-Correcting Code): Helps detect and correct memory errors, improving system stability—especially important for NAS and server environments.
• Unbuffered SODIMM: Designed for systems that require low latency and are not equipped for registered memory, such as Synology NAS units.
• Dual Rank 2Rx8 Configuration: Offers better performance in multi-tasking and data-intensive operations compared to single-rank modules.
• Voltage and Timing: Operates at 1.2V with CL19 latency, which is standard for DDR4 and ensures energy efficiency and consistent performance
• Plug-and-Play Installation: Easy to install and recognized by Synology DSM without additional configuration.

Stability & Support

• Improved System Stability: ECC memory reduces the risk of crashes and data corruption, especially under heavy workloads.
• Warranty & Support: Backed by Synology’s warranty and technical support when used in approved models.

Benefits

• ECC Technology: Automatically detects and corrects single-bit memory errors, reducing data corruption risks.
• System Stability: Ideal for 24/7 environments like file servers and virtualization hosts.
• Synology Certified: Engineered and tested for compatibility with Synology DiskStation models, guaranteeing optimal integration and support.
• Performance Boost: Enables faster file transfers, smoother multitasking, and improved responsiveness.
• Dual-Channel Support: When paired with an identical module, it supports dual-channel configuration in compatible NAS units
• Warranty-Friendly: Using Synology-certified RAM does not void your NAS warranty, unlike third-party modules

Application Use

• NAS Performance Boost: Enhances the performance of compatible Synology NAS systems by increasing memory capacity, which improves multitasking, responsiveness, and overall system efficiency.
• Error Correction (ECC): ECC technology helps detect and correct memory errors, making it ideal for data-critical environments like file servers, backup systems, and enterprise storage.
• Unbuffered SO-DIMM: This form factor is compact and fits into NAS units that require SO-DIMM modules, especially those with space constraints.
• System Compatibility: Only compatible with certain Synology NAS models—always check Synology’s offical compatibility list before upgrading.

Why Use Synology-Branded RAM?

Synology recommends using its own branded memory modules to ensure:

• Full compatibility
• System stability
• Warranty and support coverage

Using third-party RAM may lead to boot failures or instability and could void support