Razer Core-X said to be best eGPU option for the Mac Recently Apple added support to macOS to attach external GPU's (eGPU) to beef up graphics performance. For most of us high power graphics is not important - we're simply using word processors, browsing the web, and the most taxing task is watching videos. But some of us demand higher graphics performance for video processing or gaming. According to this video review the Razer Core-X is the best bang-for-the-buck in external GPU boxes.