| Features | |
| Internal memory | 4 GB |
| Memory layout (modules x size) | 1 x 4 GB |
| Internal memory type | DDR4 |
| ECC | Y |
| Buffered memory type | Unregistered (unbuffered) |
| Compatible products | 21 series:RS1221RP+, RS1221+, DS1821+, DS1621+ |
| Logistics data | |
| Harmonized System (HS) code | 84733020 |
