Double check that the correct drivers are installed and properly configured.
Manually download the driver's via the manufacturer's website. Reinstall and reconfigure.
Observe system performance via Resource Monitor or Task Manager. Use both but only one at a time.
Determine what system resources are being used, to what extent, and what is using the resource.
If you still have the RTX 2060 consider reinstalling it and observing performance. Some change in Resource allocation between the RTX 2060 and the RTX 2080 could provide a clue.