Side-by-side specifications of the Synology DS1511+ and DS918+, from official datasheets. Differences are highlighted.
| DS1511+ | DS918+ | |
| CPU | 1.8GHz dual-core | Intel Celeron J3455 |
| Cores / threads | 2 cores / 2 threads | 4 cores / 4 threads |
| RAM (base) | 1GB | 4 GB DDR3L |
| RAM (max) | 3GB | 8 GB |
| Drive bays | 5 | 4 |
| Expandable to | 10 (2× DX510) | 5 (up to 9 with DX517) |
| M.2 slots | 0 | 2 x M.2 NVMe 2280 |
| Network | 2× Gigabit | 2 x 1GbE RJ-45 |
| 10GbE | no | no |
| Max raw capacity | 15TB | 40 TB internal raw; up to 90 TB with DX517 |
| Hot-swap | yes | yes |
| Form factor | desktop | Desktop |
| Released | 2011 | 2018 |
| Power consumption | 68 W / 30 W | 28.8 W / 12.6 W |
| DSM at launch | — | — |