Side-by-side specifications of the Synology DS1522+ and DS1525+, from official datasheets. Differences are highlighted.
| DS1522+ | DS1525+ | |
| CPU | AMD Ryzen R1600 | AMD Ryzen V1500B |
| Cores / threads | 2/4 | 4/8 |
| RAM (base) | 8 GB | 8 GB |
| RAM (max) | 32 GB | 32 GB |
| Drive bays | 5 | 5 |
| Expandable to | 10 | 15 |
| M.2 slots | 2 | 2 |
| Network | 4x 1GbE | 2x 2.5GbE |
| 10GbE | optional | optional |
| Max raw capacity | 15 drives | 300 TB |
| Hot-swap | yes | yes |
| Form factor | desktop | desktop |
| Released | 2022 | 2025 |
Pick the DS1525+ if you want the stronger long-term platform: it has the newer/faster CPU, higher RAM ceiling, built-in 10GbE, and support for M.2 SSDs, plus a bump in drive/bay expansion headroom over the DS1522+. Choose the DS1522+ only if it’s meaningfully cheaper and you don’t need 10GbE or M.2, because its CPU/RAM limits and expansion options are the weaker side of the comparison.