Side-by-side specifications of the Synology DS120J and DS209j, from official datasheets. Differences are highlighted.
| DS120J | DS209j | |
| CPU | Marvell Armada 3700 88F3720 | 266MHz 32-bit |
| Cores / threads | 2-core | — |
| RAM (base) | 512 MB | 64MB |
| RAM (max) | 512 MB | 64MB |
| Drive bays | 1 | 2 |
| Expandable to | 0 | — |
| M.2 slots | 0 | 0 |
| Network | 1x 1GbE RJ-45 | 1x Gigabit |
| 10GbE | no | no |
| Max raw capacity | 16TB | 4TB |
| Hot-swap | no | yes |
| Form factor | desktop | desktop |
| Released | 2024 | 2009 |