eGPU support in Mac/macOS
Yes. Using an external GPU with your Mac (with support for eGPU) can give your computer a performance boost.

Refer to the Apple support article, Use an external graphics processor with your Mac.


  An eGPU can give your Mac additional graphics performance for professional apps, 3D gaming, VR content creation, and more.
  
  eGPUs are supported by any Thunderbolt 3-equipped Mac running macOS High Sierra 10.13.4 or later.


For a list of Thunderbolt 3 equipped Macs and to check if your Mac support eGPU, refer to the Apple support article, Adapters for the Thunderbolt 3 (USB-C) or USB-C port on your Mac or iPad Pro

These Macs have Thunderbolt 3 (USB-C) ports:


  
  iMac Pro
  iMac models from 2017
  Mac mini (2018)
  MacBook Pro models from 2016 or later
  MacBook Air (Retina, 13-inch, 2018)