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