It is not just my results that I go by. I keep score of a large number of results on another forum and the Titan old and new consistently beats out the 1080 ti.
Having said that if we are talking value for money in a gaming context then I would recommend the 1080 Ti every time.
I thought maybe you'd post some findings proving your point since you disagreed with mine, which is backed up by data spread across the Internet freely available to quote. I need to see what your results are, otherwise I can only go by tech websites. Example:
The second website I went to was Guru3D (I first visited TPU but they did not have Titan XP benchmarks listed in the way I needed), and The Witcher III was the first benchmark I clicked on. The 1080Ti FE beats the Titan XP. However, the Titan XP is obviously using older drivers which might explain the performance you are referring to. But I have that partially explained.
As you can see below, the Titan XP hasn't increased in performance in the six months between when the Titan XP and when the 1080Ti (and more specifically the MSI Lightning 1080Ti) were benched. Likely because it's not been tested again and the numbers are being reused. I hate that but that's not much anyone could do about it.
(Recent drivers)
(Older drivers)
But drivers for the 1080 haven't improved performance by a considerable amount as shown below so why would the Titan XP? Note the boost clock of the FE 1080 in the below image.
Now note the boost clock of the Aorus 1080 that was reviewed last month. It's considerably higher. It also has a substantial memory overclock from the factory.
Now note the score in Rise of the Tomb Raider for the original FE 1080 review and the more recent Aorus 1080 review with recent driver updates. It goes from 100 FPS to 110. That performance benefit can mostly be attributed to the 140Mhz additional boost the Aorus achieves over the FE 1080 and the 11Gbps memory overclock from the factory. Only a small amount can be attributed to drivers. This suggests drivers have not improved performance dramatically for Pascal. It has only been marginal in a game like RotTR.
My point is, while this is not definitive information, it's all I have to go by. I can't afford to buy every fancy new graphics card that comes out. According to the findings of Guru3D (again, second site I went to, first benchmark I clicked on), the 1080Ti is within margin of error of the Titan XP. You corrected me by saying, "1080 Ti does not beat an old Pascal Titan or the newer Titan Xp." But according to the only results I have available to me (without scouring OCN or other forums), the 1080Ti DOES beat the Titan XP, and that's without the AIB partner factory overclocks, or more specifically GPU Boost 3.0 overclocks.
But really does it matter? Why did you even bother correcting me since the point was not that the 1080Ti BEAT the Titan XP but that it came within such a close margin and regularly stood strong against it that it shocked a lot of gamers. That's the point. Correcting me just seemed pedantic, or maybe an attempt to prove your worth when you've given me no reason to trust you over anyone else. That isn't meant to offend. I'm pointing out what I've said about others. Don't just tell me how I'm wrong when I'm not an idiot. I don't just pluck numbers from my a**hole. There is data there. If you have different data that disproves it, prove it.