Side-by-side specifications of the Synology DS115 and DS216J, from official datasheets. Differences are highlighted.
| DS115 | DS216J | |
| CPU | Marvell Armada 375 | Marvell Armada 385 dual-core |
| Cores / threads | 2 | 2 |
| RAM (base) | 512MB DDR3 | 512MB DDR3 |
| RAM (max) | 512MB | 512MB |
| Drive bays | 1 | 2 |
| Expandable to | 0 | no |
| M.2 slots | 0 | 0 |
| Network | 1x Gigabit | 1x 1GbE RJ-45 |
| 10GbE | no | no |
| Max raw capacity | 6TB | 16TB |
| Hot-swap | no | yes |
| Form factor | desktop | desktop |
| Released | 2014 | 2015 |