Side-by-side specifications of the Synology RS3412xs and RS3413xs+, from official datasheets. Differences are highlighted.
| RS3412xs | RS3413xs+ | |
| CPU | Intel Core i3 Dual Core 3.1GHz | — |
| Cores / threads | 2 cores / 4 threads | — |
| RAM (base) | 2GB ECC | 8 GB ECC |
| RAM (max) | 6GB ECC | 32 GB ECC |
| Drive bays | 10 | 10 |
| Expandable to | 24 | 2 |
| M.2 slots | 0 | 0 |
| Network | 4x Gigabit | 4× Gigabit |
| 10GbE | optional | optional |
| Max raw capacity | 100TB | 40 TB |
| Hot-swap | yes | yes |
| Form factor | 2U rackmount | 2U rackmount |
| Released | 2012 | 2013 |
| Power consumption | — | 144 W / 96 W |
| DSM at launch | — | — |
Choose the RS3413xs+ if you want the clear upgrade: it has a faster Intel Atom C3538 CPU, higher RAM ceiling (up to 32 GB vs 8 GB), and more bays plus expansion support (12 bays with expansion to 16 vs 12 bays with expansion to 24). It also includes 10GbE, while neither model has M.2 slots. The RS3412XS is only worth it if it’s significantly cheaper and your workload is light.