Side-by-side specifications of the Synology DS1813+ and DS3611xs, from official datasheets. Differences are highlighted.
| DS1813+ | DS3611xs | |
| CPU | dual-core CPU | — |
| Cores / threads | 2 cores / unknown threads | — |
| RAM (base) | 2 GB | 2 GB ECC |
| RAM (max) | 4 GB | 8 GB ECC |
| Drive bays | 8 | 12 |
| Expandable to | 10 (2 DX513 units) | 24 |
| M.2 slots | 0 | 0 |
| Network | 4 x Gigabit | 4x Gigabit Ethernet |
| 10GbE | no | optional |
| Max raw capacity | 72 TB | 100 TB |
| Hot-swap | yes | yes |
| Form factor | tower | Tower |
| Released | 2013 | 2011 |
| Power consumption | 75.19 W / 34.12 W | — |
| DSM at launch | — | — |