Side-by-side specifications of the Synology RS217 and RS409, from official datasheets. Differences are highlighted.
| RS217 | RS409 | |
| CPU | Marvell ARMADA 385 88F6820 1.33GHz | 1.2GHz |
| Cores / threads | 2 cores / 2 threads | — |
| RAM (base) | 512 MB DDR3 | 256MB |
| RAM (max) | 512 MB | — |
| Drive bays | 2 | 4 |
| Expandable to | 0 | 4 |
| M.2 slots | 0 | 0 |
| Network | 2x 1GbE RJ-45 | 2x Gigabit |
| 10GbE | no | no |
| Max raw capacity | 28 TB | 3TB |
| Hot-swap | yes | yes |
| Form factor | 1U rackmount | 1U rackmount |
| Released | 2016 | — |
| Power consumption | — | 52.8 W / 23 W |
| DSM at launch | — | 2.1 |