if (as dalto mentioned) the inxi is fine dont worry about it.
also since you want to game, check nvidia-smi . It will also show the driver version.
- you may want to run
nvidia-inst --32as it will add stuff for gaming. checknvidia-inst -hfor options.
For your games starting on the wrong monitor (i think this is what you mean) you can check the steam settings (if its installed on steam) or the games ingame settings, you should be able to fix it that way, else maybe KDE primary Monitor settings may work out?
Also, if you are interested. I have the same issue, as you can see in this long thread, we came to the solution that its just a graphical error from KDE, nothing tragical. As games and everything else operate just fine.