You can choose any resolution you want in the game options. The default recommendation of 1280×1024 is a compromise between quality and performance. for the best possible quality choose 1600×1200 or 1920×1440. Just keep an eye on performance, especially new games might not run fast enough with higher resolutions. If your monitor does not support these resolutions, running games windowed may help.
In a handful of games (e.g. Skyrim) you can also upscale internally in vorpX. The according option is called Internal Resolution Upscale and can be found on the image page of the vorpX ingame menu if it is avilable for a game.
i tested other resolution but i got error.
default resolution only has no error.
did I forgot something to install??
i have latest ocullus software but all of games runs in my system with low quality in oculus rift DK2. and make me have headache!
what should I do?
Try to run the game windowed. As stated above, if you run games fullscreen, your monitor has to support the resolution in question. If for example you have a 1920×1080 monitor, you likely won’t be able to run games with 1600×1200 unless you run them windowed.