Side-by-side specifications of the Synology DS1621xs+ and DS3018xs, from official datasheets. Differences are highlighted.
| DS1621xs+ | DS3018xs | |
| CPU | Intel Xeon D-1527 | Intel Pentium D1508 |
| Cores / threads | 4 cores | 2c/2t |
| RAM (base) | 8 GB | 8 GB |
| RAM (max) | 32 GB | 32 GB |
| Drive bays | 6 | 6 |
| Expandable to | 16 | 30 |
| M.2 slots | 2 | 2 |
| Network | 2x1GbE, 1x10GbE | 4 x 1GbE |
| 10GbE | yes | optional |
| Max raw capacity | 256 TB | 300 TB |
| Hot-swap | yes | yes |
| Form factor | desktop | desktop |
| Released | 2020 | 2018 |