Side-by-side specifications of the Synology DS1815+ and SA6400, from official datasheets. Differences are highlighted.
| DS1815+ | SA6400 | |
| CPU | Intel Atom C2538 | AMD EPYC 7272 |
| Cores / threads | 4 cores / 4 threads | 12 cores / 24 threads |
| RAM (base) | 2 GB DDR3 | 32 GB DDR4 ECC RDIMM |
| RAM (max) | 6 GB | 1024 GB |
| Drive bays | 8 | 12 |
| Expandable to | 10 (DX513; 18 total) | 108 |
| M.2 slots | 0 | — |
| Network | 4x Gigabit Ethernet | 4×1GbE RJ-45, 2×10GbE RJ-45, 1×management LAN |
| 10GbE | no | yes |
| Max raw capacity | 48 TB internal; 108 TB with DX513 expansion | 1.944 PB |
| Hot-swap | yes | yes |
| Form factor | Tower | 2U rackmount |
| Released | 2014 | 2025 |
| Power consumption | — | 180.5 W / 88.56 W |
| DSM at launch | — | — |