Synology - DDR4 - Module - 4 GB - SO DIMM 260-PIN - Unbuffered - ECC Memory size: 4 GB For Synology DiskStation: Series 25: DS925+ Synology DDR4 memory module For optimal compatibility and reliability, always use original Synology memory modules. Installing other memory modules can lead to system instability or boot failure. Synology does not provide a full product warranty or technical support if the memory expansion uses non-Synology memory modules. https://elecena.pl/product/29330825/d4ns01-4g-ram-module 2025-09-05 https://elecena.pl/product/29330825/d4ns01-4g-ram-module 2026-02-19