I see this said all the time and it is extremely silly. Just because there are new games that don't run at 120Hz and 4k with the highest settings on a recent card doesn't mean that "GPUs can't do 120Hz at 4k". Graphics settings, more GPUs, games that are just a few years old, and anything not game related still apply. Saying "GPUs can't do 120Hz at 4k" is nonsense.