Side-by-side specifications of the Synology DS115j and DS120J, from official datasheets. Differences are highlighted.
| DS115j | DS120J | |
| CPU | Marvell Armada 370 | Marvell Armada 3700 88F3720 |
| Cores / threads | 1/1 | 2-core |
| RAM (base) | 512 MB | 512 MB |
| RAM (max) | 512 MB | 512 MB |
| Drive bays | 1 | 1 |
| Expandable to | 0 | 0 |
| M.2 slots | 0 | 0 |
| Network | 1x Gigabit | 1x 1GbE RJ-45 |
| 10GbE | no | no |
| Max raw capacity | 5 TB | 16TB |
| Hot-swap | no | no |
| Form factor | desktop | desktop |
| Released | 2015 | 2024 |