Synology DiskStation (DS Series) NAS Memory

Memory for Synology DiskStation desktop NAS — 17 DS models, each matched to the exact module its unit takes.

The DS range splits cleanly on ECC. The compact plus units — DS220+, DS420+, DS423+, DS620slim, DS720+, DS920+, DS1520+ — take non-ECC SODIMM. The larger plus and xs+ units — DS723+, DS923+, DS1621+, DS1621xs+, DS1821+, DS1823xs+, DS2419+II, DS2422+, DS3617xsII, DS3622xs+ — take ECC SODIMM. Both are the same physical laptop-format module, both fit the same slot, and only one will work in a given unit.

Everything current runs DDR4-2666; the DS620slim is the outlier at DDR3-1866. Densities from 4GB to 16GB.

Memory is what unlocks DSM. Most DiskStations ship with 4GB soldered or in one slot, and that's enough to serve files and nothing else. Docker containers, Virtual Machine Manager, Synology Photos indexing, Surveillance Station, and Btrfs snapshots all want headroom — and on the xs+ units running heavier workloads, memory is what stops DSM paging under concurrent access.

Check your model's maximum before ordering. Synology publishes an official maximum per model that is often lower than the hardware will physically accept, and it varies within the same generation. Use Shop by System Model to filter to your unit, or send us the model and we'll confirm the part, the slot count and the realistic ceiling.

Lifetime warranty on every module. Purchase orders, net terms and volume pricing for business, government and education buyers.

See also: Synology NAS Memory by Part Number