Moving to ultra-quality shows a 17% reduction in performance at 1080p for the GTX 1080. Incredibly, at this resolution we are only receiving just over 60fps with the mighty GTX 1080. The Fury X dropped to a 53fps average, while the Nano was only good for 49fps.
The GTX 1080 is reduced to 43fps at 1440p, which we consider still playable but far from ideal. The Fury X wasn't bad either though the occasional dips below 30fps were noticeable.
24fps with the GTX 1080 at 4K... enough said, really. For playable performance here you're looking at a pair of Pascal Titan X cards.