Side-by-side specifications of the Synology DS115j and DS119j, from official datasheets. Differences are highlighted.
| DS115j | DS119j | |
| CPU | Marvell Armada 370 800 MHz | Marvell Armada 3700 88F3720, 800 MHz |
| Cores / threads | 1 core / 1 thread | 2 cores / 2 threads |
| RAM (base) | 256 MB DDR3 | 256 MB DDR3L non-ECC |
| RAM (max) | 256 MB | 256 MB |
| Drive bays | 1 | 1 |
| Expandable to | 0 | 0 |
| M.2 slots | 0 | 0 |
| Network | 1 x Gigabit Ethernet | 1 x 1GbE RJ-45 |
| 10GbE | no | no |
| Max raw capacity | 5 TB | 12 TB raw; 108 TB maximum single volume |
| Hot-swap | no | no |
| Form factor | Desktop | Desktop |
| Released | 2015 | 2018 |
| Power consumption | 14.5 W / 3.85 W | 10.04 W / 5.01 W |
| DSM at launch | — | — |