Side-by-side specifications of the Synology RS409RP+ and RS422+, from official datasheets. Differences are highlighted.
| RS409RP+ | RS422+ | |
| CPU | unknown | AMD Ryzen R1600 |
| Cores / threads | unknown | 2 cores / 4 threads |
| RAM (base) | unknown | 2 GB DDR4 ECC |
| RAM (max) | unknown | — |
| 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 drives | 108 TB per volume |
| Hot-swap | yes | yes |
| Form factor | 1U rackmount | 1U |
| Released | 2009 | 2022 |
| Power consumption | 61 W / 29 W | — |
| DSM at launch | 2.1 | — |