Side-by-side specifications of the Synology DS210J and DS210+, from official datasheets. Differences are highlighted.
| DS210J | DS210+ | |
| CPU | 800MHz | 1.06 GHz |
| Cores / threads | — | — |
| RAM (base) | 128 MB | DDR |
| RAM (max) | 128 MB | — |
| Drive bays | 2 | 2 |
| Expandable to | no | — |
| M.2 slots | 0 | 0 |
| Network | 1x Gigabit | 1GbE x1 |
| 10GbE | no | no |
| Max raw capacity | 4 TB | — |
| Hot-swap | yes | — |
| Form factor | desktop | 2-bay desktop NAS |
| Released | 2009 | 2010 |
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.