I tried my pc at my parents house yesterday who have a 4k tv,i haven't tried any of the newest games and tbh i'm not even sure which are the most demanding as i am still quite behind with games as i took around 5 years off gaming which has worked out well as i have a nice catalog to catch up on. I was however surprised just how well my rx5700 was holding up at 4k i tried Rise of the Tomb Raider, Modern Warfare Remastered ,Gears 5 and far cry 4, I'm guessing tomb raider may be the most demanding? they all seemed to averaged between 50-60fps with most settings on high and for me not being used to anything over 60fps they played awesomely, 4k 60hz is definitely enough for me.
I wasn't sure how much of a difference i would notice going from 1080p to 4k but the difference was HUGE, especially in games like cod and far cry everything just looks so much more clear and i could see enemies clearly in the distance i could not see anywhere near as clear before, The details on the weapons and some of the scenery looked amazing. That was also going from a 42" screen to a 55" so now sure how much the screen size played in that but for me Far cry which i am really enjoying at the moment looked immense at 4k it felt so much more submersive, it was genuinely comparable to trying VR for the first time i was not expecting it to look so much better, I can't wait to finish far cry 4 and play far cry 5 now.
100% Going to upgrade the GPU first, if i find its not enough for the latest most demanding games i'll just upgrade everything else when i can, Super excited having got a taste of 4k now though, even 4k videos i watched on YouTube was another new world. Scared to try playing at 120hz or more now incase the same thing happens, i don't think i could be happy with 1080p again now.