High Sierra to Catalina update

Hello, So I am currently having a perfectly working latest version of High Sierra due to Nvidia graphic card. I would like to update to Catalina, but iGPU would not be enough for me. Could someone suggest me a cheap natively supported AMD GPU? My current one is 750 Ti. Can I use the same config.plist with updated kexts? What else should I do to get it working.

Thank You very much in advance.

submitted by /u/ozumado
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