Seems fairly smooth, I'm on 2080. Every once in a while it does crash, but nothing serious. I think bloom was over overcranked on first level a bit, but later on, it's gorgeous! Very atmospheric feel. Lighting in the castle with windows looks wonderful. Rain effect is top! Rats are epic!
Forgot to mention, I'm on 460, the guy who I'm watching play through is on 2080 and its smooth.