Side-by-side specifications of the Synology DS210j and DS211j, from official datasheets. Differences are highlighted.
| DS210j | DS211j | |
| CPU | 800 MHz | Marvell 88F6281 |
| Cores / threads | 1 core / 1 thread | 1/1 |
| RAM (base) | 128 MB | 128 MB |
| RAM (max) | — | 128 MB |
| Drive bays | 2 | 2 |
| Expandable to | 0 | 0 |
| M.2 slots | 0 | 0 |
| Network | 1× Gigabit Ethernet | 1x Gigabit Ethernet |
| 10GbE | no | no |
| Max raw capacity | 4 TB | 6 TB |
| Hot-swap | no | no |
| Form factor | Desktop | Desktop |
| Released | 2009 | 2010 |
| Power consumption | 25 W / 10 W | 28.2 W / 9.5 W |
| DSM at launch | 2.2 | — |