It's all a matter of preferencw . The user decides which supported setting...is most desireable.
1920 x 1080 is the maximum resolution supported by the monitor (same as this one)...whiile 2046 x 1536 is the maximum supported by your video card.
When you right-click on the desktop, click Properties...then click the Settings tab...you will see a graphical presentatio of all resolutions which are possible with your video card. By moving the slider to the left or to the right,..and then clicking the Apply button, you can try each of these.
Whichever you prefer is the one that you want .
Just remember...smaller numbers present larger pictures on the monitor . I believe that 800 x 600 is the default XP resolution used by Windows before the correct video drivers are installed on a system. This is the resolution that results when the system goes into safe mode (because motherboard drivers are not yet installed).
Anything supported that you can adjust the resolution to...are your options.