For gaming, it's an estimated 24% faster than a 1080 for twice the price.
http://www.anandtech.com/show/10325/the-nvidia-geforce-gtx-1...
http://www.anandtech.com/show/10325/the-nvidia-geforce-gtx-1...
http://www.anandtech.com/show/9059/the-nvidia-geforce-gtx-ti...
http://www.geforce.co.uk/hardware/10series/titan-x/
The Tesla cards are the ones with no display outputs.