RTX 2080Ti and CUDA version

I have an RTX 2080Ti. Where can I get the relationship between RTX 2080Ti and CUDA version? I seem to be unable to use CUDA9.0 in the program, but CUDA10.1 is available.(In fact, I need CUDA 9.0 to run the codes)

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You can look up the CUDA compute for the RTX 2080 Ti on the NVIDIA website:

Which says that you need a CUDA compute capability of 7.5
The RTX 2080 Ti is a Turing-based card.

The CUDA toolkit documentation, https://docs.nvidia.com/cuda/ has the details of when 7.5 capability was introduced. The details about the compabiliity for your card are at https://docs.nvidia.com/cuda/turing-compatibility-guide/index.html you.

There you will find that you need CUDA 10.0 or higher if you want to recompile your program to have native support for your RTX 2080 Ti.