Side-by-side specifications of the Synology RS3617xs+ and SA3400D, from official datasheets. Differences are highlighted.
| RS3617xs+ | SA3400D | |
| CPU | Intel Xeon D-1531 2.2 GHz | Intel Xeon D-1541 |
| Cores / threads | 6 cores / 12 threads | 8 cores / 16 threads |
| RAM (base) | 8 GB DDR4 ECC UDIMM | 8 GB DDR4 ECC UDIMM per controller |
| RAM (max) | 64 GB | 64 GB per controller |
| Drive bays | 12 | 12 |
| Expandable to | 24 (2× RX1217/RX1217RP) | 36 total with 2× RXD1219sas |
| M.2 slots | 0 | 0 |
| Network | 4× 1GbE RJ-45; 2× 10GBase-T RJ-45 | 2× 1GbE + 1× 10GbE per controller |
| 10GbE | yes | yes |
| Max raw capacity | 360 TB | 192 TB raw; 576 TB expanded |
| Hot-swap | yes | yes |
| Form factor | 2U rackmount | 2U rackmount |
| Released | 2017 | 2025 |
| Power consumption | — | 257.78 W / unknown |
| DSM at launch | — | — |