Upgrading from NVIDIA's GTX 1070 GPU to GTX 1080 Ti: Is it worth it?

[Windows Central]

Is going from a GTX 1070 to a GTX 1080 Ti a huge leap?
NVIDIAs GTX 1070 is a very good graphics card, but its GTX 1080 Ti is an absolute beast. Or that's what we're led to believe, anyway. For less than the cost of a Titan Xp you can have performance that is very close, and on paper at least, the GTX 1080 Ti is a sizeable jump forward from the GTX 1070.
I just upgraded from the 1070 to the 1080 Ti, so I was interested to see just how big a leap forward it was.

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