The TMC2209 drive the stepper motors ultra silent and also the motors stay very cool, so is more or less a must to use them.
The website FYSETC Wiki Silent2209 contains a good description how the motor current should be adjusted. and the Stepper driver current and Vref calculator makes it easy to calculate the right current.
- Max. current: 2.0
- Safety buffer: 20%
- Driver: TMC2209
- VRef: 1.14V