Side-by-side specifications of the Synology DS1515+ and DS1517+, from official datasheets. Differences are highlighted.
| DS1515+ | DS1517+ | |
| CPU | Intel Atom C2538 | Intel Atom C2538 2.4GHz |
| Cores / threads | 4 cores / 4 threads | 4 cores / 4 threads |
| RAM (base) | 2 GB DDR3 | 2 GB DDR3 SO-DIMM |
| RAM (max) | 6 GB | 16 GB |
| Drive bays | 5 | 5 |
| Expandable to | 10 (with DX513) | 10 (2×DX517) |
| M.2 slots | 0 | 2 via M2D17 adapter |
| Network | 4 x Gigabit | 4×1GbE RJ-45 |
| 10GbE | no | optional |
| Max raw capacity | 30 TB internal; 90 TB with DX513 expansion | 108 TB |
| Hot-swap | yes | yes |
| Form factor | Desktop | Desktop |
| Released | 2015 | 2017 |
| Power consumption | 72.5 W / 18.4 W | — |
| DSM at launch | — | — |