Graphics card is indispensable for gamers. External screens are devices that are used especially in laptop computers when the video cards on the computer are insufficient. macOS now officially supports External GPUs. External graphics processors or eGPUs are officially supported in the released macos High Sierra 10.13.04.To take advantage of its benefits, you will need a Mac with a Thunderbolt 3 (USB-C) port. That means it’s limited to 2016 and later MacBooks, 2017 and later iMacs, and the iMac Pro. Applications using Metal, OpenGL, and OpenCL can use the eGPU, as can virtual reality headsets. You can use multiple Thunderbolt 3 (USB-C) ports to connect multiple devices.