Side-by-side specifications of the Synology DVA3219 and DVA3221, from official datasheets. Differences are highlighted.
| DVA3219 | DVA3221 | |
| CPU | Intel Atom C3538 | Intel Atom C3538, 2.1 GHz |
| Cores / threads | 4 cores / 4 threads | 4 cores / 4 threads |
| RAM (base) | 4 GB DDR4 | 8 GB DDR4 non-ECC (4 GB x 2) |
| RAM (max) | 32 GB | 32 GB (16 GB x 2) |
| Drive bays | 4 | 4 |
| Expandable to | 10 | 10 (2 x DX517) |
| M.2 slots | 0 | 0 |
| Network | 4× 1GbE RJ-45 | 4 x 1GbE RJ-45 |
| 10GbE | no | no |
| Max raw capacity | 224 TB | 64 TB internal; 224 TB with 2 x DX517 |
| Hot-swap | yes | yes |
| Form factor | Desktop | Tower |
| Released | 2019 | 2020 |
| Power consumption | — | 43.92 W / 28.43 W |
| DSM at launch | — | — |
Pick the DVA3221 if you want the newer, faster platform: it uses a much stronger Intel Celeron J4125, supports up to 6 GB RAM, and has 8 bays with expansion support. It also adds dual M.2 NVMe slots and 10GbE options, while the older DVA3219 is built on a weaker Intel Celeron J3455, tops out at 6 GB RAM, and has 4 bays with no M.2/10GbE.