Synology 8GB DDR4 SO-DIMM ECC Memory Module

The Synology D4ES03-8G is an 8GB DDR4 ECC Unbuffered SO-DIMM memory module designed and validated by Synology for use in compatible Synology NAS devices. Sourced directly from Synology, this module ensures full compatibility and reliability in supported NAS enclosures, removing the guesswork often associated with third-party memory upgrades. Error-Correcting Code (ECC) memory is a key advantage for NAS and small server environments. Unlike standard non-ECC RAM, ECC memory detects and corrects single-bit memory errors on the fly, reducing the risk of data corruption and unplanned downtime — a critical consideration when the NAS is serving as the backbone for business data, media archives, or virtualisation workloads. The SO-DIMM form factor makes this module suited to compact NAS enclosures that use laptop-style memory slots rather than full-size DIMMs. Installing Synology-validated memory helps maintain system stability and may be a prerequisite for full Synology warranty and support coverage on select models. The module carries a 5-year warranty as stated by the source. Verified Specifications: - Part Number: D4ES03-8G - Capacity: 8 GB - Memory Standard: DDR4 - Form Factor: SO-DIMM (Small Outline Dual In-line Memory Module) - ECC Type: ECC Unbuffered - Memory Category: Server / NAS Memory - GTIN / EAN: 4711174726455 - Warranty: 5 Years (as stated by source) - Compatible Series (partial, as listed by source): 25-series including DS1825+, DS1525+, DS925+ and others — consult the Synology compatibility list for your specific model before purchase Note: Speed (MHz), voltage, and CAS latency specifications are not confirmed in available source data and have been omitted to avoid unverified claims. Always verify NAS model compatibility against Synology's official compatibility list prior to purchase