Side-by-side specifications of the Synology DS207+ and DS209, from official datasheets. Differences are highlighted.
| DS207+ | DS209 | |
| CPU | 500 MHz | 1.2 GHz |
| Cores / threads | 1 core / 1 thread | 1 core / 1 thread |
| RAM (base) | 128 MB | 256 MB |
| RAM (max) | — | 256 MB |
| Drive bays | 2 | 2 |
| Expandable to | 0 | 0 |
| M.2 slots | 0 | 0 |
| Network | 1× Gigabit Ethernet | 1x Gigabit |
| 10GbE | no | no |
| Max raw capacity | 2 TB internal | 4 TB |
| Hot-swap | no | no |
| Form factor | Desktop | desktop |
| Released | 2007 | 2009 |
| Power consumption | 28.76 W / 11.04 W | 25 W / unknown |
| DSM at launch | — | 2.2 |
Choose the DS209 if you want the newer, more capable box: it has the faster CPU, higher RAM ceiling, and the same 2-bay layout. Neither model offers 10GbE or M.2, and neither can be expanded beyond its two drive bays.