Different settings. You can easily get up to 60/70 fps depending on the combinations of settings you use. Its all on what looks good enough to you. That being said, while the 1080 doesn't necessarily make a huge, gigantic, enormous fps jump, it does add 10 or 15 fps extra, and allows you to turn a lot of previously untenable settings on while doing so.
In this second video I change a few settings, and the fps jumps. Change a few more and I am at 50fps. Turn off HDR and I am at 70fps, etc........
Very happy with the card, so far.