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I've been using eGPUs for gaming (on Windows though) on my MacBook Pro for a few years now. macOS introduced official eGPU support and now there seem to be numerous compatible enclosures: https://egpu.io/macos-high-sierra-official-external-gpu/

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A laptop with powerful external GPU is also a nice way to have quite portable VR setup

Which GPU are you using?

nvidia gtx 970. My setup is pretty diy with an external 200W power supply. Today I would get one of those nice enclosures mentioned in the article. You loose around 10% performance compared to an internal GPU.

BTW: Windows 10 also has pretty solid eGPU support on my MBP at least.

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