Side-by-side specifications of the Synology RS409 and RS411, from official datasheets. Differences are highlighted.
| RS409 | RS411 | |
| CPU | 1.2GHz | 1.6 GHz |
| Cores / threads | — | 1/1 |
| RAM (base) | 256MB | 512 MB |
| RAM (max) | — | 512 MB |
| Drive bays | 4 | 4 |
| Expandable to | 4 | 0 |
| M.2 slots | 0 | 0 |
| Network | 2x Gigabit | 2 x Gigabit Ethernet |
| 10GbE | no | no |
| Max raw capacity | 3TB | 16 TB |
| Hot-swap | yes | yes |
| Form factor | 1U rackmount | 1U rackmount |
| Released | — | 2010 |
| Power consumption | 52.8 W / 23 W | 53 W / unknown |
| DSM at launch | 2.1 | 3.0 |