Side-by-side specifications of the Synology FS1018 and FS3420, from official datasheets. Differences are highlighted.
| FS1018 | FS3420 | |
| CPU | Intel Pentium D1508 | Intel Xeon D-1739 |
| Cores / threads | 2 cores / 2 threads | 8 cores / 16 threads |
| RAM (base) | 8 GB DDR4 ECC SODIMM | 32 GB DDR4 ECC RDIMM |
| RAM (max) | 32 GB | 192 GB |
| Drive bays | 12 | 24 × 2.5-inch SATA SSD |
| Expandable to | 24 (DX1215 x 2) | 0 |
| M.2 slots | 0 (via optional adapter card) | 0 |
| Network | 4x 1GbE | 2 × 10GbE RJ-45 |
| 10GbE | optional | yes |
| Max raw capacity | 48 TB internal; 288 TB with 2x DX1215 | 1 PB |
| Hot-swap | yes | yes |
| Form factor | desktop | 2U rackmount |
| Released | 2018 | 2026 |
| Power consumption | — | 122.0 W / unknown |
| DSM at launch | — | — |