: The X3 mode was specifically updated to reduce visual artifacts in dark scenes and on complex, patterned textures.
: It is best used for high-refresh monitors (240Hz+) starting from a base of 60 FPS . Lossless Scaling v2.1.1
Even at version 2.1.1, the software isn't perfect. Here are the common bugs and their community-sourced fixes: : The X3 mode was specifically updated to