Side-by-side specifications of the Synology RS409+ and RS422+, from official datasheets. Differences are highlighted.
| RS409+ | RS422+ | |
| CPU | — | AMD Ryzen R1600 |
| Cores / threads | — | 2 cores / 4 threads |
| RAM (base) | — | 2 GB DDR4 ECC |
| RAM (max) | — | — |
| Drive bays | 4 | 4 |
| Expandable to | 4 via RX4 | 0 |
| M.2 slots | 0 | 0 |
| Network | 2 x Gigabit | 2 × 1GbE RJ-45 |
| 10GbE | no | optional |
| Max raw capacity | 8 HDDs | 108 TB per volume |
| Hot-swap | yes | yes |
| Form factor | 1U rackmount | 1U |
| Released | 2009 | 2022 |
| Power consumption | 28 W / 9.5 W | — |
| DSM at launch | 2.1 | — |