Side-by-side specifications of the Synology DS212j and DS212+, from official datasheets. Differences are highlighted.
| DS212j | DS212+ | |
| CPU | — | 2.0 GHz |
| Cores / threads | — | — |
| RAM (base) | — | 512 MB |
| RAM (max) | — | — |
| Drive bays | 2 | 2 |
| Expandable to | 0 | 0 |
| M.2 slots | 0 | 0 |
| Network | 1× Gigabit | 1x Gigabit |
| 10GbE | no | no |
| Max raw capacity | 6 TB | 6 TB |
| Hot-swap | no | yes |
| Form factor | desktop | Desktop |
| Released | 2011 | 2011 |
| Power consumption | 17.6 W / null | 18.7 W / 7.9 W |
| DSM at launch | — | — |
Choose the DS212+ if you want the faster CPU and more headroom: it has the better processor, supports up to 512 MB RAM, and is the stronger pick for heavier SMB use. Both are 2-bay units with no expansion, no 10GbE, and no M.2, so the real decision is performance versus budget; the DS212J is the lighter home option.