Side-by-side specifications of the Synology DS210j and DS210+, from official datasheets. Differences are highlighted.
| DS210j | DS210+ | |
| CPU | 800 MHz | 1.06 GHz 64-bit |
| Cores / threads | 1 core / 1 thread | — |
| RAM (base) | 128 MB | DDR |
| RAM (max) | — | — |
| Drive bays | 2 | 2 |
| Expandable to | 0 | 0 |
| M.2 slots | 0 | 0 |
| Network | 1× Gigabit Ethernet | 1GbE |
| 10GbE | no | no |
| Max raw capacity | 4 TB | — |
| Hot-swap | no | — |
| Form factor | Desktop | desktop |
| Released | 2009 | 2010 |
| Power consumption | 25 W / 10 W | 30 W / null |
| DSM at launch | 2.2 | 2.3 |
Pick the DS210+ if you want the faster Intel CPU and the much higher RAM ceiling; it’s the better choice for heavier multitasking, more users, and general longevity. Both are 2-bay units with no expansion, and neither has 10GbE or M.2. Choose the DS210J only if it’s cheaper and your use is basic file backup/media serving.