we have problems with a SketchUp Pro 2019 Windows version and a new RTX2080.
The checkup tool shows no video ram, but I found some hints here in the forums this might be a known bug from the checkup tool.
Anyways SketchUp is way slower than it was with the older GPU (AMD Radeon), but GPU drivers are up to date. Latest SketchUp Update is also installed and GPU benchmarking tools show the expected performance of the TX2080, just SketchUp wont work.
I tried some nvidia settings, but nothing changed.