Side-by-side specifications of the Synology FS3400 and FS3410, from official datasheets. Differences are highlighted.
| FS3400 | FS3410 | |
| CPU | Intel Xeon D-1541 2.1 GHz | Intel Xeon D-1541, 2.1/2.7 GHz |
| Cores / threads | 8 cores / 16 threads | 8 cores / 16 threads |
| RAM (base) | 16 GB DDR4 ECC RDIMM | 16 GB DDR4 ECC RDIMM |
| RAM (max) | 128 GB | 128 GB |
| Drive bays | 24 | 24 |
| Expandable to | 72 | — |
| M.2 slots | 0 | — |
| Network | 4 x 1GbE RJ-45, 2 x 10GbE RJ-45 | 4× 1GbE RJ-45, 2× 10GbE RJ-45, 1× out-of-band management |
| 10GbE | yes | yes |
| Max raw capacity | 184.32 TB | 1 PB |
| Hot-swap | yes | yes |
| Form factor | 2U rackmount | 2U |
| Released | 2022 | — |
| Power consumption | 313.84 W / 125.77 W | 113.84 W / null |
| DSM at launch | — | — |
Choose the FS3410 if you want the newer Intel Xeon D-1541, a higher RAM ceiling, and built-in 10GbE; it’s the better long-term pick for performance and growth. The FS3400 is the older model with a weaker CPU, lower max memory, and fewer expansion-oriented features. Both are 24-bay flash servers, but if M.2 and bay/expansion flexibility matter, the FS3410 is the safer buy.