Side-by-side specifications of the Synology RS1221+ and RS1626xs+, from official datasheets. Differences are highlighted.
| RS1221+ | RS1626xs+ | |
| CPU | AMD Ryzen V1500B | Intel Xeon D-1726 |
| Cores / threads | 4/8 | 6/12 |
| RAM (base) | 4 GB | 16 GB |
| RAM (max) | 32 GB | 64 GB |
| Drive bays | 8 | 4 |
| Expandable to | 12 | 16 |
| M.2 slots | 2 | 2 |
| Network | 4x 1GbE RJ-45 | 2x 10GbE + 1 OOB |
| 10GbE | optional | yes |
| Max raw capacity | 108 TB | 1 PB |
| Hot-swap | yes | yes |
| Form factor | 2U | 1U |
| Released | 2021 | 2026 |