Side-by-side specifications of the Synology DS1813+ and DS3615xs, from official datasheets. Differences are highlighted.
| DS1813+ | DS3615xs | |
| CPU | dual-core CPU | Intel Core i3-4130 3.4GHz |
| Cores / threads | 2 cores / unknown threads | 2 cores / 4 threads |
| RAM (base) | 2 GB | 4GB DDR3 ECC |
| RAM (max) | 4 GB | 32GB |
| Drive bays | 8 | 12 |
| Expandable to | 10 (2 DX513 units) | 24 |
| M.2 slots | 0 | 0 |
| Network | 4 x Gigabit | 4 x Gigabit |
| 10GbE | no | optional |
| Max raw capacity | 72 TB | 216TB |
| Hot-swap | yes | yes |
| Form factor | tower | Tower |
| Released | 2013 | 2015 |
| Power consumption | 75.19 W / 34.12 W | — |
| DSM at launch | — | — |