Side-by-side specifications of the Synology DS1815+ and DS3617xs, from official datasheets. Differences are highlighted.
| DS1815+ | DS3617xs | |
| CPU | Intel Atom C2538 | Intel Xeon D-1527 |
| Cores / threads | 4 cores / 4 threads | 4 cores / 8 threads |
| RAM (base) | 2 GB DDR3 | 16 GB DDR4 ECC SO-DIMM |
| RAM (max) | 6 GB | 48 GB |
| Drive bays | 8 | 12 |
| Expandable to | 10 (DX513; 18 total) | 24 |
| M.2 slots | 0 | 0 |
| Network | 4x Gigabit Ethernet | 4 x 1GbE RJ-45 |
| 10GbE | no | optional |
| Max raw capacity | 48 TB internal; 108 TB with DX513 expansion | 360 TB with 2 x DX1215 |
| Hot-swap | yes | yes |
| Form factor | Tower | desktop |
| Released | 2014 | 2017 |
| Power consumption | — | — |
| DSM at launch | — | — |