Macos Monterey install eGPU

GROMACS version:2021.4
GROMACS modification: No
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I have automatically installed gromacs 2021.4 through homebrew on the Macos Monterey system, but I want to add an eGPU to accelerate the operation. How can I add an eGPU to gromacs? At the same time, the Macos monterey system no longer supports nvidia graphics cards. Which amd graphics card is more suitable? Have you encountered the same situation, please give some suggestions.