Side-by-side specifications of the Synology DS416 and DS416j, from official datasheets. Differences are highlighted.
| DS416 | DS416j | |
| CPU | Marvell Armada 385 | Marvell Armada 88F6828 1.3GHz |
| Cores / threads | dual-core | 2 |
| RAM (base) | 1 GB | 512MB |
| RAM (max) | 1 GB | 512MB |
| Drive bays | 4 | 4 |
| Expandable to | 0 | 0 |
| M.2 slots | 0 | 0 |
| Network | 2x 1GbE | 1x1GbE |
| 10GbE | no | no |
| Max raw capacity | 32 TB | 32TB |
| Hot-swap | yes | yes |
| Form factor | desktop | desktop |
| Released | 2016 | 2016 |
Pick the DS416 if you want the better platform: it has the stronger CPU and a higher RAM ceiling, while still giving you 4 bays for the same basic expansion as the DS416j. Neither model has built-in 10GbE or M.2 support, so those are not differentiators here.