It’s not though. How it works is you set the DSR factors globally within nvidia control panel and then just choose to apply the higher resolutions in the games of your choice ie within the game in the same way you would otherwise adjust the resolution in the relevant in game settings. The extra resolution choices you have in game will be based on how many of the DSR factors you ticked. I have DSR set up within MSFS on a ultra wide 2k monitor, and the results are incredible despite the cost of a relatively minor but acceptable FPS hit. Essentially a 4K experience on a 2k monitor.
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