Side-by-side specifications of the Synology DS120J and DS223, from official datasheets. Differences are highlighted.
| DS120J | DS223 | |
| CPU | Marvell Armada 3700 88F3720 | Realtek RTD1619B |
| Cores / threads | 2-core | 4/4 |
| RAM (base) | 512 MB | 2 GB DDR4 non-ECC |
| RAM (max) | 512 MB | 2 GB |
| Drive bays | 1 | 2 |
| Expandable to | 0 | 0 |
| M.2 slots | 0 | 0 |
| Network | 1x 1GbE RJ-45 | 1x 1GbE |
| 10GbE | no | no |
| Max raw capacity | 16TB | 108 TB |
| Hot-swap | no | yes |
| Form factor | desktop | 2-bay desktop NAS |
| Released | 2024 | 2026 |