Side-by-side specifications of the Synology DS118 and DS119j, from official datasheets. Differences are highlighted.
| DS118 | DS119j | |
| CPU | Realtek RTD1296, 1.4 GHz | Marvell Armada 3700 88F3720, 800 MHz |
| Cores / threads | 4 cores / 4 threads | 2 cores / 2 threads |
| RAM (base) | 1 GB DDR4 non-ECC | 256 MB DDR3L non-ECC |
| RAM (max) | — | 256 MB |
| Drive bays | 1 | 1 |
| Expandable to | 0 | 0 |
| M.2 slots | 0 | 0 |
| Network | 1 x 1GbE RJ-45 | 1 x 1GbE RJ-45 |
| 10GbE | no | no |
| Max raw capacity | 10 TB | 12 TB raw; 108 TB maximum single volume |
| Hot-swap | no | no |
| Form factor | Desktop | Desktop |
| Released | 2017 | 2018 |
| Power consumption | 9.4 W / 4.22 W | 10.04 W / 5.01 W |
| DSM at launch | — | — |
Choose the DS118 if you want the faster Intel CPU, 1 GB RAM ceiling, and the better chance of smoother performance under heavier SMB use; choose the DS119j only if you want the cheapest basic single-bay box. Both are 1-bay units with no expansion, and neither has 10GbE or M.2.