Side-by-side specifications of the Synology RS3411XS and RS3412XS, from official datasheets. Differences are highlighted.
| RS3411XS | RS3412XS | |
| CPU | unknown | Intel Core i3 3.1GHz |
| Cores / threads | unknown | 2 |
| RAM (base) | 4GB | 2GB ECC |
| RAM (max) | 8GB | 6GB |
| Drive bays | 10 | 10 |
| Expandable to | 2 via RX1211/RX1211RP | 2x RX1211 |
| M.2 slots | 0 | 0 |
| Network | 4x Gigabit | 4x GbE |
| 10GbE | optional | optional |
| Max raw capacity | 30TB base; up to 100TB with expansion | 100TB |
| Hot-swap | yes | yes |
| Form factor | 2U | 2U rackmount |
| Released | 2011 | 2012 |
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.