Side-by-side specifications of the Synology RS812+ and RS812RP+, from official datasheets. Differences are highlighted.
| RS812+ | RS812RP+ | |
| CPU | Intel Atom Dual Core 2.13 GHz | Intel Atom Dual Core 2.13 GHz |
| Cores / threads | 2 cores / 2 threads | 2 cores / 2 threads |
| RAM (base) | 1 GB DDR3 | 1 GB DDR3 |
| RAM (max) | 3 GB | 3 GB |
| Drive bays | 4 | 4 |
| Expandable to | 4 via RX410 | 4 (RX410) |
| M.2 slots | 0 | 0 |
| Network | 2x Gigabit | 2x Gigabit |
| 10GbE | no | no |
| Max raw capacity | 24 TB with RX410 | 24 TB with RX410 |
| Hot-swap | yes | yes |
| Form factor | 1U rackmount | 1U rackmount |
| Released | — | — |
| Power consumption | 46.2 W / null | 46.2 W / unknown |
| DSM at launch | — | — |
Choose the RS812RP+ only if you want redundant power supplies; otherwise the RS812+ is the same class of box for less money. Both are 4-bay units with no 10GbE and no M.2, and neither has expansion support. The decisive specs are effectively identical here: same CPU family and the same RAM ceiling, so the RP+’s only real advantage is power redundancy.