Generic Synology 16GB DDR4 SO-DIMM ECC Memory Module

The Synology D4ES03-16G is a 16 GB DDR4 ECC Unbuffered SO-DIMM memory module designed and validated specifically for compatible Synology NAS devices. Unlike generic desktop or laptop RAM, this module incorporates Error-Correcting Code (ECC) technology, which continuously detects and corrects single-bit memory errors in real time. This is particularly important in always-on NAS environments where data integrity is a priority — even a single uncorrected memory error can lead to file-system corruption or unexpected system reboots. The SO-DIMM (Small Outline Dual In-Line Memory Module) form factor is compact by design, making it the correct physical format for Synology's desktop and tower NAS enclosures. Being unbuffered, the module communicates directly with the memory controller without an additional register layer, which is the standard configuration for the supported Synology 25-series platforms. Synology certifies specific memory modules for each NAS model to ensure stability under continuous workloads such as RAID rebuilds, Surveillance Station video recording, and multi-user file serving. Using a Synology-validated module like the D4ES03-16G helps avoid compatibility issues that can arise with non-certified third-party RAM. Confirmed compatible models from the 25 series include the DS1825+ and DS1525+. Buyers should consult Synology's official compatibility list for the full matrix of supported devices before purchase. Verified Specifications: • Part Number: D4ES03-16G • Capacity: 16 GB • Memory Generation: DDR4 • Form Factor: SO-DIMM (Small Outline) • ECC: Yes — Unbuffered ECC • Memory Category: Server / NAS Memory • Stated Warranty: 5 years (per source listing) • Compatible Series (sourced): Synology 25 series — DS1825+, DS1525+ (partial list) Note: Clock speed, CAS latency, and voltage were not specified in the available source data and have therefore been omitted from this listing. Manual review is recommended to confirm the full compatibility list and technical specifications before publication