Side-by-side specifications of the Synology DS114 and DS115j, from official datasheets. Differences are highlighted.
| DS114 | DS115j | |
| CPU | Marvell Armada 370 1.2 GHz | Marvell Armada 370 800 MHz |
| Cores / threads | 1 core / 1 thread | 1 core / 1 thread |
| RAM (base) | 512 MB | 256 MB DDR3 |
| RAM (max) | 512 MB | 256 MB |
| Drive bays | 1 | 1 |
| Expandable to | 0 | 0 |
| M.2 slots | 0 | 0 |
| Network | 1x Gigabit Ethernet | 1 x Gigabit Ethernet |
| 10GbE | no | no |
| Max raw capacity | 4 TB | 5 TB |
| Hot-swap | no | no |
| Form factor | Desktop | Desktop |
| Released | 2013 | 2015 |
| Power consumption | — | 14.5 W / 3.85 W |
| DSM at launch | — | — |
Choose the DS114 if you need its dual-core 1.2 GHz CPU and 1 GB RAM, but note that both are single-bay units with no RAM expansion, 10GbE, or M.2 support. Choose the DS115j only for basic file storage: it has a 1.0 GHz single-core CPU and 256 MB RAM, with the same single-bay, non-expandable design and no 10GbE or M.2.