https://www.techradar.com/news/apple-and-blackmagic-designed-this-egpu-to-turbocharge-macbook-pros

Apple announced external GPU support for Macs at WWDC 2017, and now the company teamed up with the cinema company Blackmagic to develop a new eGPU designed specifically for the new MacBook Pros announced today.

Simply named the Blackmagic eGPU, this external graphics card enclosure is powered by a AMD Radeon Pro 580 featuring 8GB of video memory, 256-bit memory bandwidth and 36 discrete compute units for a total of 5.5 teraflops of processing power.