Side-by-side specifications of the Synology DS425+ and DS508, from official datasheets. Differences are highlighted.
| DS425+ | DS508 | |
| CPU | Intel Celeron J4125 | — |
| Cores / threads | 4/4 | — |
| RAM (base) | 2 GB | — |
| RAM (max) | 6 GB | — |
| Drive bays | 4 | 5 |
| Expandable to | 0 | — |
| M.2 slots | 2 | 0 |
| Network | 1x1GbE + 1x2.5GbE | 2x GbE |
| 10GbE | no | no |
| Max raw capacity | 108 TB | 5x HDD |
| Hot-swap | yes | yes |
| Form factor | desktop | desktop |
| Released | 2025 | 2008 |
Choose the DS425+ if you want a newer Intel CPU, more RAM headroom, and M.2 NVMe support; it’s the better pick for snappier apps, caching, and future-proofing. Choose the DS508 if you need more drive bays and built-in 10GbE for higher raw storage capacity or faster wired transfers, but it gives up the newer CPU/RAM ceiling and M.2 support.