Side-by-side specifications of the Synology FS1018 and FS3400, from official datasheets. Differences are highlighted.
| FS1018 | FS3400 | |
| CPU | Intel Pentium D1508 | Intel Xeon D-1541 2.1 GHz |
| Cores / threads | 2 cores / 2 threads | 8 cores / 16 threads |
| RAM (base) | 8 GB DDR4 ECC SODIMM | 16 GB DDR4 ECC RDIMM |
| RAM (max) | 32 GB | 128 GB |
| Drive bays | 12 | 24 |
| Expandable to | 24 (DX1215 x 2) | 72 |
| M.2 slots | 0 (via optional adapter card) | 0 |
| Network | 4x 1GbE | 4 x 1GbE RJ-45, 2 x 10GbE RJ-45 |
| 10GbE | optional | yes |
| Max raw capacity | 48 TB internal; 288 TB with 2x DX1215 | 184.32 TB |
| Hot-swap | yes | yes |
| Form factor | desktop | 2U rackmount |
| Released | 2018 | 2022 |
| Power consumption | — | 313.84 W / 125.77 W |
| DSM at launch | — | — |