Especificaciones de los Synology RS4021xs+ y RS6426xs+ en paralelo, de las fichas técnicas oficiales. Las diferencias están resaltadas.
| RS4021xs+ | RS6426xs+ | |
| CPU | Intel Xeon D-1541 | Intel Xeon D-1739 |
| Núcleos / hilos | 8 cores / 16 threads | 8 cores / 16 threads |
| RAM (base) | 16 GB DDR4 ECC UDIMM | 16 GB DDR4 ECC RDIMM |
| RAM (máx.) | 64 GB | 96 GB |
| Bahías | 16 | 16 |
| Ampliable a | 40 (with 2× RX1217/RX1217RP) | 64 |
| Ranuras M.2 | Optional via PCIe adapter cards | 0 (via optional adapter card) |
| Red | 4× 1GbE RJ-45; 2× 10GbE RJ-45 | 2 × 10GbE RJ-45 + 1 × out-of-band management LAN |
| 10GbE | yes | yes |
| Capacidad bruta máx. | 1 PB single volume | 64 drives |
| Intercambio en caliente | yes | yes |
| Formato | 3U rackmount | 3U rackmount |
| Lanzamiento | 2021 | 2026 |
| Consumo | 145.79 W / 62.68 W | 165.45 W / 73.38 W |
| DSM de lanzamiento | — | — |