Yep, you read this correctly. Buy an compatible external Thunderbolt 3 GPU chassis, add any freaking video card(s) of your choice, AMD Radeon or Nvidia Pascal video card and boooooom! You are no longer limited by your Mac built-in GPU. Native support is the big news here. Even though it's not fully implemented yet, it shows promises.
https://9to5mac.com/2017/06/07/hands-on-macos-high-sierra-native-egpu-support-shows-promise-video/
