If you already own a DDR4 stick but are unsure about it's serial number then you can use CPU-Z to help you identify it (in the spd tab)!
| RAM serial number |
|---|
| Tigo-3000Mhz-8G |
| CMK16GX4M2B3000C15 |
| 3200 C16 Series |
| CMK16GX4M2B3200C16 |
| 3600 C17 Series |
| F4-3200C16-8GTZKW |
| TEAMGROUP-UD4-2400 |