Side-by-side specifications of the Synology RS3411xs and RS3412xs, from official datasheets. Differences are highlighted.
| RS3411xs | RS3412xs | |
| CPU | — | Intel Core i3 Dual Core 3.1GHz |
| Cores / threads | — | 2 cores / 4 threads |
| RAM (base) | 4 GB | 2GB ECC |
| RAM (max) | 8 GB | 6GB ECC |
| Drive bays | 10 | 10 |
| Expandable to | 12 with RX1211/RX1211RP | 24 |
| M.2 slots | 0 | 0 |
| Network | 4x Gigabit | 4x Gigabit |
| 10GbE | optional | optional |
| Max raw capacity | 100 TB | 100TB |
| Hot-swap | yes | yes |
| Form factor | 2U rackmount | 2U rackmount |
| Released | 2011 | 2012 |
| Power consumption | 115.5 W / 57.2 W | — |
| DSM at launch | — | — |
Choose the RS3412XS if you want the stronger platform: it uses a newer Intel Atom CPU, supports more RAM, and is the better base for growth. The RS3411XS is older and more limited on memory and expansion; the decisive practical difference is that neither is a modern NVMe/M.2 system, so M.2 is not the buying factor here. If 10GbE is required, check the exact installed/available network card support on the unit you’re buying, because that’s usually an add-on rather than the core difference between these two.