Synology 16GB DDR4 ECC Unbuffered SODIMM 25 series:DS1825+, DS1525+, DS925+

DDR Memory
For certain business-oriented NAS servers, Synology offers the ability to upgrade RAM capacity to reach a higher state of performance and reliability. The DDR RAM module have been customized and fine tuned by Synology engineers so they work fully with the servers and will greatly lower the chance of system crashing due to compatibility issues.