Side-by-side specifications of the Synology FS2017 and FS3420, from official datasheets. Differences are highlighted.
| FS2017 | FS3420 | |
| CPU | Intel Xeon D-1541 2.1GHz | Intel Xeon D-1739 |
| Cores / threads | 8 cores / 16 threads | 8 cores / 16 threads |
| RAM (base) | 16 GB DDR4 ECC RDIMM | 32 GB DDR4 ECC RDIMM |
| RAM (max) | 128 GB | 192 GB |
| Drive bays | 24 | 24 × 2.5-inch SATA SSD |
| Expandable to | 72 with 2× RX2417sas | 0 |
| M.2 slots | 0 | 0 |
| Network | 4× 1GbE RJ-45, 2× 10GBase-T RJ-45 | 2 × 10GbE RJ-45 |
| 10GbE | yes | yes |
| Max raw capacity | 48 TB internal raw | 1 PB |
| Hot-swap | yes | yes |
| Form factor | 2U rackmount | 2U rackmount |
| Released | 2017 | 2026 |
| Power consumption | — | 122.0 W / unknown |
| DSM at launch | — | — |