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Thats quite understandable. Your GTX1080i uses compute capability 6.1 while the Titan V uses compute capabiltiy 7.0. This is not enabled by default in OpenCV yet (the card is just to god dam new), which means your VOLTA architecture is officially not supported yet.
It is even so new that official CUDA compute capability page does not yet mention the card: https://developer.nvidia.com/cuda-gpus
My suggestion, use CUDA9 (CUDA8 does not support 7.0 compute capability) and try specifying the compute capability explicitly when building OpenCV yourself. However I expect some issues to turn up once you do this.
