Side-by-side specifications of the Synology DS213+ and DS420j, from official datasheets. Differences are highlighted.
| DS213+ | DS420j | |
| CPU | Marvell Armada XP MV78230 dual-core 1.0 GHz | Realtek RTD1296 1.4 GHz |
| Cores / threads | 2 cores / 2 threads | 4 cores / 4 threads |
| RAM (base) | 512 MB DDR3 | 1 GB DDR4 non-ECC |
| RAM (max) | 512 MB | 1 GB |
| Drive bays | 2 | 4 |
| Expandable to | 0 | 0 |
| M.2 slots | 0 | 0 |
| Network | 1× Gigabit Ethernet | 1 x 1GbE RJ-45 |
| 10GbE | no | no |
| Max raw capacity | 8 TB (2×4 TB) | 64 TB |
| Hot-swap | yes | no |
| Form factor | tower | Desktop |
| Released | 2013 | 2020 |
| Power consumption | 18.4 W / 2.6 W | 21.71 W / 7.88 W |
| DSM at launch | 4.2 | — |