Depends on the situation, which is why I think Vega Frontier Edition ($1000) is the apt comparison against the Titan XP ($1200).
The 1080 Ti has less RAM, and has NO support for 16-bit packed arithmetic. Ultimately, the 1080 TI is a graphics card designed to dominate video games, and NVidia cuts out other features that gamers don't care about.
With regards to the "Compute" sector, its Vega Frontier ($1000) vs Titan XP ($1200) at the low-end at least. NVidia Tesla chips ($4000 to $7000) constitute the higher-end.
The 1080 Ti has less RAM, and has NO support for 16-bit packed arithmetic. Ultimately, the 1080 TI is a graphics card designed to dominate video games, and NVidia cuts out other features that gamers don't care about.
With regards to the "Compute" sector, its Vega Frontier ($1000) vs Titan XP ($1200) at the low-end at least. NVidia Tesla chips ($4000 to $7000) constitute the higher-end.