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External GPU uses thunderbolt 3 for connecting mac. Thunderbolt connection is 40gbs.Normal internal GPU is 252gbsApple says that eGPU increases performance. How? Bandwith of the connection is 40gbs, so it won´t be able to pass through as much data as the internal gpu.Right?"Apps that use Metal, OpenCL, and OpenGL can now take advantage of the increased performance that external graphics processors can bring. The External Graphics Development Kit includes everything you need to start optimizing advanced VR and 3D apps on external graphics processors with macOS High Sierra.1"https://developer.apple.com/development-kit/external-graphics/