Question about Synology D4NESO-2666-4G

I bought a DS920+ and would like to expand the 4 GB RAM right from the start. It's my first NAS and I don't have the experience yet, but I see the sense in upgrading already at the beginning. My question: Regardless of the warranty, is the difference from +4 GB Synology (thus 8 GB) to (e.g.) +16 GB effectively noticeable? SO noticeable that it is recommended from the start, or is one well served with 8 GB?