Side-by-side specifications of the Synology DS1515 and DS1517, from official datasheets. Differences are highlighted.
| DS1515 | DS1517 | |
| CPU | Annapurna Labs Alpine AL-514 | Annapurna Labs Alpine AL-314 1.7GHz |
| Cores / threads | 4 cores / 4 threads | 4 cores / 4 threads |
| RAM (base) | 2 GB | 2 GB DDR3L |
| RAM (max) | 2 GB | 2 GB |
| Drive bays | 5 | 5 |
| Expandable to | 15 | 10 (2× DX517) |
| M.2 slots | 0 | 0 |
| Network | 4 x 1GbE | 4× 1GbE RJ-45 |
| 10GbE | no | no |
| Max raw capacity | 40 TB | 75 TB |
| Hot-swap | yes | yes |
| Form factor | Desktop | Desktop |
| Released | 2015 | 2017 |
| Power consumption | — | 39.5 W / null |
| DSM at launch | — | — |