Side-by-side specifications of the Synology RS814 and RS814+, from official datasheets. Differences are highlighted.
| RS814 | RS814+ | |
| CPU | Intel Atom dual-core 2.13 GHz | Intel Atom 2.13 GHz dual-core |
| Cores / threads | 2 cores / 2 threads | 2 cores / 2 threads |
| RAM (base) | 1 GB DDR3 | 2 GB DDR3 |
| RAM (max) | unknown | 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 | 32 TB with RX410 | 40 TB with RX410 |
| Hot-swap | yes | yes |
| Form factor | 1U rackmount | 1U rackmount |
| Released | 2014 | 2014 |
| Power consumption | unknown | — |
| DSM at launch | — | — |
Choose the RS814+ if you need more performance headroom: it has the faster CPU, higher RAM ceiling, and is the only one of the two that can take 10GbE; the RS814 does not. Both are 4-bay units with no M.2 support, and neither has built-in expansion in the sense of a bigger internal drive count beyond those 4 bays.