Side-by-side specifications of the Synology DS107+ and DS108J, from official datasheets. Differences are highlighted.
| DS107+ | DS108J | |
| CPU | 500 MHz | Marvell 88F5182 |
| Cores / threads | — | 1/1 |
| RAM (base) | 64MB | 32 MB |
| RAM (max) | 128MB | 32 MB |
| Drive bays | 1 | 1 |
| Expandable to | 0 | 0 |
| M.2 slots | 0 | 0 |
| Network | 1x Gigabit | 1x Gigabit |
| 10GbE | no | no |
| Max raw capacity | 1 TB | 1 TB |
| Hot-swap | no | no |
| Form factor | 1-bay desktop | desktop |
| Released | 2007 | 2008 |
Pick the DS107+ if you want the stronger box: it has the faster CPU and higher RAM ceiling, while the DS108J is the slower entry model with less memory headroom. Both are single-bay units, so there’s no expansion, and neither offers 10GbE or M.2.