system
A chat on subreddit /r/pcmasterrace
human
I played RDR2 on a 1080 Ti and got at least 70FPS. The thing is DO NOT MAX out the Settings. Its like GTA5 where the Sliders go way beyond Ultra and you lose half your FPS for no visual gain.

Google Optimized Settings, dont blindly max out everything and then cry like a little kid when you get 30FPS.
gpt
hardware unboxed did an excellent video when the game launched with the best settings for optimal performance/visuals. Search it on YouTube, highly recommended.