Phoronix published a review on the NVIDIA GeForce GTX 1070 Ti, Takes On The Radeon RX Vega 64 Under Linux A quote from the article:

Last week NVIDIA began shipping the GeForce GTX 1070 Ti graphics card as an offering at the $449 USD price point to undercut the Radeon RX Vega 56. Here are some benchmarks of the GeForce GTX 1070 Ti under Linux with the latest OpenGL/Vulkan drivers compared to Radeon RX Vega, the rest of the Pascal GPUs, and other graphics cards under a variety of different Linux gaming benchmarks with 12 cards in total being tested this round.

 NVIDIA GeForce GTX 1070 Ti, Takes On The Radeon RX Vega 64 Under Linux @ Phoronix