https://wccftech.com/macos-catalina-10-15-is-not-playing-well-with-different-egpus/

macOS Catalina has not been getting the best of reviews lately. Whether it is due to its lack of compatibility with 32-bit apps, too many security prompts or lackluster Project Catalyst apps, users have been reporting a lot of issues. The latest additions to this list are macOS Catalina’s eGPU troubles. Using an eGPU with macOS Catalina is causing all sorts of bugs like system freezes and app-related issues.

Users with the latest Mac mini and Radeon 570 or Radeon 580 eGPUs are reporting the most issues. The problems range from not being able to boot up the Mac mini, to third-party apps freezing and even a ‘white screen of deaht’. In such setups, the monitor is usually connected to the eGPU. Some users have reported a working solution to connect the monitor directly to the Mac, while still using the eGPU for graphics acceleration. Vega graphics cards do not seem to cause any issues.