That's within the spec yes. The latest driver update however seems to have lost 3FPS somewhere, normally It's a solid 50+ under all conditions for a GTX 1080 (non-Ti)
You can flip anti-aliasing off (it doesn't improve anything at this resolution), and you may want to go into the nVidia control panel driver settings and make sure multi-threaded rendering is enabled and PhysX is on the GPU.
Mine is set this way:
http://i.imgur.com/SLWKpwK.png
Depending on your monitor, you may want to try Adaptive VSync, that may eliminate tearing completely.