Using ECC (error-correcting code) memory matters specifically for NAS/storage workloads: it detects and corrects single-bit memory errors on the fly, protecting against silent data corruption in a system that's meant to be the reliable, always-on storage backbone for a business - a failure mode a non-ECC consumer memory module simply can't guard against. Synology's own compatibility list requires all installed modules in a multi-DIMM configuration to be identical, so this module is meant to be paired with others of the same part number when upgrading capacity (the RS6426xs+, for example, supports up to 96GB across six of these 16GB modules). It carries a 5-year manufacturer warranty, matching the long service life expected of the rackmount NAS platforms it's designed for. Because it's a registered (buffered) module rather than an unbuffered one, it also reduces electrical load on the memory controller - part of why Synology's 26-series platforms can scale to such large total memory pools across six populated slots.