Custom Resolution Utility (CRU)

[SkOrPn]

Hey guys quick question please. I have an old 2560x1440p korean monitor the Catleap from way back in 2012, yes the one that overclocks great. I just upgraded to the new Radeon 2020 Adrenaline today and when I was creating my new resolutions something occurred to me that I know would probably only be answered here.

If I use 1440p at 60Hz (native res) for everything in Windows 10 but launch games at 1080p, will the game be using the custom 1080p @ 100Hz resolution that I created using CRU? Or does the game just set its very own 1080p 60Hz resolution? And if so, is there a way to make games launch the custom 100Hz res when the game starts but automatically go back to 1440p 60Hz when the game quits? I'm only really interested in 100Hz when playing fast paced games.

Thanks