I have a 1660Ti. I get 40+ fps on 1080p. It's functional. Now, whether it is really any better than the previous generation is the more relevant question in my opinion. There are a few things improved, and a whole lot missing. The performance issues are only a small fragment of the game's issues.
runs alright for me, too. just alright, but for what it is that's fine.
however it's not really much better than the predecessor, and needs to give me a reason to give up on the HUGE mod community and well documented approaches from CS1.
