The Synology 4GB ECC SOD DDR4 D4es04-4G is a high-quality memory module designed for computers and networking devices. With a total capacity of 4GB and ECC memory features, this SO-DIMM module offers reliable performance and error correction for improved data accuracy. The single module design makes it easy to install and upgrade, providing a seamless upgrade solution for your system's memory requirements. With the trusted Synology brand and ECC RAM technology, this product ensures stable and efficient performance for your computer or networking device.Great for someone looking to add more genuine Synology RAM to their NAS