Side-by-side specifications of the Synology DS1515 and DS918+, from official datasheets. Differences are highlighted.
| DS1515 | DS918+ | |
| CPU | Annapurna Labs Alpine AL-514 | Intel Celeron J3455 |
| Cores / threads | 4 cores / 4 threads | 4 cores / 4 threads |
| RAM (base) | 2 GB | 4 GB DDR3L |
| RAM (max) | 2 GB | 8 GB |
| Drive bays | 5 | 4 |
| Expandable to | 15 | 5 (up to 9 with DX517) |
| M.2 slots | 0 | 2 x M.2 NVMe 2280 |
| Network | 4 x 1GbE | 2 x 1GbE RJ-45 |
| 10GbE | no | no |
| Max raw capacity | 40 TB | 40 TB internal raw; up to 90 TB with DX517 |
| Hot-swap | yes | yes |
| Form factor | Desktop | Desktop |
| Released | 2015 | 2018 |
| Power consumption | — | 28.8 W / 12.6 W |
| DSM at launch | — | — |