Side-by-side specifications of the Synology RS2416RP+ and RS2418+, from official datasheets. Differences are highlighted.
| RS2416RP+ | RS2418+ | |
| CPU | Intel Atom C2538 2.4GHz | Intel Atom C3538 |
| Cores / threads | 4 cores / 4 threads | 4 cores / 4 threads |
| RAM (base) | 2GB DDR3 | 4 GB DDR4 non-ECC UDIMM |
| RAM (max) | 6GB | 64 GB |
| Drive bays | 12 | 12 |
| Expandable to | 12 | 12 (up to 24 total with RX1217/RX1217RP) |
| M.2 slots | 0 | 0; optional M.2 SATA adapter card |
| Network | 4x 1GbE RJ-45 | 4 x 1GbE RJ-45 |
| 10GbE | no | optional |
| Max raw capacity | 168TB with RX1214/RX1214RP | 144 TB internal; 288 TB with 1 expansion unit |
| Hot-swap | yes | yes |
| Form factor | 2U rackmount | 2U rackmount |
| Released | 2016 | 2018 |
| Power consumption | — | 109 W / 52.4 W |
| DSM at launch | — | 6.2 |
Choose the RS2418+ if you need more performance: it has a newer 4-core Atom C3538 versus the RS2416RP+’s 4-core Atom C2538, and supports up to 32GB RAM versus 6GB. Both provide 12 bays and expansion capability, but neither includes 10GbE or built-in M.2 NVMe slots, so choose the RS2418+ for its higher RAM ceiling and newer platform.