Side-by-side specifications of the Synology DS1515 and DS1525+, from official datasheets. Differences are highlighted.
| DS1515 | DS1525+ | |
| CPU | Annapurna Labs Alpine AL-514 | AMD Ryzen V1500B |
| Cores / threads | 4 cores / 4 threads | 4 cores / 8 threads |
| RAM (base) | 2 GB | 8 GB DDR4 ECC SODIMM |
| RAM (max) | 2 GB | 32 GB (16 GB x 2) |
| Drive bays | 5 | 5 |
| Expandable to | 15 | 15 total (2 x DX525) |
| M.2 slots | 0 | 2 NVMe |
| Network | 4 x 1GbE | 2 x 2.5GbE RJ-45 |
| 10GbE | no | optional |
| Max raw capacity | 40 TB | 300 TB raw |
| Hot-swap | yes | yes |
| Form factor | Desktop | Desktop |
| Released | 2015 | 2025 |
| Power consumption | — | 44.56 W / 13.63 W |
| DSM at launch | — | — |