Side-by-side specifications of the Synology RS812 and RS814RP+, from official datasheets. Differences are highlighted.
| RS812 | RS814RP+ | |
| CPU | Intel Atom Dual Core 2.13 GHz | Intel Atom C2538 2.13 GHz |
| Cores / threads | 2 cores / 2 threads | 4 cores / 4 threads |
| RAM (base) | 1 GB DDR3 | 2 GB DDR3 |
| RAM (max) | 3 GB | 4 GB |
| Drive bays | 4 | 4 |
| Expandable to | 4 via RX410 | 4 via RX410 |
| M.2 slots | 0 | 0 |
| Network | 2x Gigabit | 4x Gigabit Ethernet |
| 10GbE | no | no |
| Max raw capacity | 24 TB with RX410 | 40 TB with RX410 |
| Hot-swap | yes | yes |
| Form factor | 1U rackmount | 1U rackmount |
| Released | 2012 | 2014 |
| Power consumption | 37 W / unknown | — |
| DSM at launch | — | — |
Choose the RS814RP+ if you need more headroom: it has a much faster CPU, 2 GB RAM vs the RS812’s 1 GB, and a redundant PSU. Both are 4-bay units with no built-in 10GbE, no M.2, and no expansion chassis support, so the decision is mainly performance and reliability.