Side-by-side specifications of the Synology DS1511+ and DS1517+, from official datasheets. Differences are highlighted.
| DS1511+ | DS1517+ | |
| CPU | 1.8GHz dual-core | Intel Atom C2538 2.4GHz |
| Cores / threads | 2 cores / 2 threads | 4 cores / 4 threads |
| RAM (base) | 1GB | 2 GB DDR3 SO-DIMM |
| RAM (max) | 3GB | 16 GB |
| Drive bays | 5 | 5 |
| Expandable to | 10 (2× DX510) | 10 (2×DX517) |
| M.2 slots | 0 | 2 via M2D17 adapter |
| Network | 2× Gigabit | 4×1GbE RJ-45 |
| 10GbE | no | optional |
| Max raw capacity | 15TB | 108 TB |
| Hot-swap | yes | yes |
| Form factor | desktop | Desktop |
| Released | 2011 | 2017 |
| Power consumption | 68 W / 30 W | — |
| DSM at launch | — | — |