Side-by-side specifications of the Synology DS213+ and DS409slim, from official datasheets. Differences are highlighted.
| DS213+ | DS409slim | |
| CPU | Marvell Armada XP MV78230 dual-core 1.0 GHz | 1.2GHz |
| Cores / threads | 2 cores / 2 threads | — |
| RAM (base) | 512 MB DDR3 | 128MB DDR800 |
| RAM (max) | 512 MB | — |
| Drive bays | 2 | 4 |
| Expandable to | 0 | 0 |
| M.2 slots | 0 | 0 |
| Network | 1× Gigabit Ethernet | 1x Gigabit Ethernet |
| 10GbE | no | no |
| Max raw capacity | 8 TB (2×4 TB) | 3TB |
| Hot-swap | yes | yes |
| Form factor | tower | Desktop, 2.5-inch |
| Released | 2013 | 2010 |
| Power consumption | 18.4 W / 2.6 W | 19 W / 12 W |
| DSM at launch | 4.2 | 2.3 |