Side-by-side specifications of the Synology RS815RP+ and RS818+, from official datasheets. Differences are highlighted.
| RS815RP+ | RS818+ | |
| CPU | Intel Atom C2538 | Intel Atom C2538 |
| Cores / threads | 4c/4t | 4-core |
| RAM (base) | 2 GB | 2 GB |
| RAM (max) | 6 GB | 16 GB |
| Drive bays | 4 | 4 |
| Expandable to | 8 | 8 |
| M.2 slots | 0 | 0 |
| Network | 4x Gigabit | 4 x 1GbE |
| 10GbE | no | optional |
| Max raw capacity | 24 TB | 80 TB |
| Hot-swap | yes | yes |
| Form factor | 1U rackmount | 1U rackmount |
| Released | 2015 | 2017 |