Side-by-side specifications of the Synology FS3017 and FS3420, from official datasheets. Differences are highlighted.
| FS3017 | FS3420 | |
| CPU | 2 x Intel Xeon E5-2620 | Intel Xeon D-1739 |
| Cores / threads | 12 cores / 24 threads | 8 cores / 16 threads |
| RAM (base) | 64GB DDR4 ECC RDIMM | 32 GB DDR4 ECC RDIMM |
| RAM (max) | 512GB | 192 GB |
| Drive bays | 24 | 24 × 2.5-inch SATA SSD |
| Expandable to | 48 | 0 |
| M.2 slots | 0 | 0 |
| Network | 2 x 10GBase-T RJ-45 | 2 × 10GbE RJ-45 |
| 10GbE | yes | yes |
| Max raw capacity | 72 drives | 1 PB |
| Hot-swap | yes | yes |
| Form factor | 2U rackmount | 2U rackmount |
| Released | 2017 | 2026 |
| Power consumption | — | 122.0 W / unknown |
| DSM at launch | 6.1 | — |