Thanks for the kind offer, I just searched for suitable software.
For OpenGL test; a Quake engine derived game would suitable, like Call_of_Duty_Dawnville_Demo.exe, which seems to be available here: https://http.download.nvidia.com/downloads/nZone/demos/
For Direct3D 9.0c maybe one of the 3Dmark benchmark suites, edition 2006 or older. Available for free on the official site: https://benchmarks.ul.com/legacy-benchmarks
In Catalyst control center, Graphics Settings, 3D, Anti-Aliasing: Uncheck the "Use application settings". This will force 2x AA mode to improve polygon edges.