Side-by-side specifications of the Synology RS2211RP+ and RS2212RP+, from official datasheets. Differences are highlighted.
| RS2211RP+ | RS2212RP+ | |
| CPU | Dual Core 1.8 GHz | Dual Core 2.13 GHz |
| Cores / threads | 2 cores / 2 threads | 2 cores / 2 threads |
| RAM (base) | 1 GB DDR2 | 1 GB DDR3 |
| RAM (max) | 3 GB | 3 GB |
| Drive bays | 10 | 10 |
| Expandable to | 12 | 12 |
| M.2 slots | 0 | 0 |
| Network | 2x Gigabit | 2 x Gigabit |
| 10GbE | no | no |
| Max raw capacity | 30 TB | 66 TB |
| Hot-swap | yes | yes |
| Form factor | 2U rackmount | 2U rackmount |
| Released | 2011 | 2012 |
| Power consumption | — | — |
| DSM at launch | — | — |
Choose the RS2212RP+ if you need more performance: it uses a faster dual-core Atom D2701 versus the RS2211RP+’s Atom D525 and supports up to 3GB RAM versus 1GB. Both are 10-bay units with 10GbE expansion capability, but the RS2212RP+ supports more expansion capacity; neither has built-in M.2 slots.