I recently went from 2500K @4.4ghz + gtx 970 to 8600K @ 4.5ghz + 1080ti and the difference is night and day in games i previously struggled with at 1440P.
AC odyssey for example was stuck at an unplayable 35-40 fps low settings to now 90+ fps constant at ultra settings,, im using ACO as an example as its probably the hardest game on the market to run today.
BF1 is another that brought my 2500K to its knees even on low setings as its a cpu hog , but now is now butter smooth ultra 1440 never drops below 130fps and almost always at 144fps + again night and day difference here.
AC odyssey for example was stuck at an unplayable 35-40 fps low settings to now 90+ fps constant at ultra settings,, im using ACO as an example as its probably the hardest game on the market to run today.
BF1 is another that brought my 2500K to its knees even on low setings as its a cpu hog , but now is now butter smooth ultra 1440 never drops below 130fps and almost always at 144fps + again night and day difference here.