https://www.techradar.com/news/these-older-graphics-cards-are-compatible-with-macos-mojave

Apple has just released macOS 10.14 Mojave, its latest version of the operating system for Macs and MacBooks, but if you’re running an older Mac Pro, released between mid-2010 and mid-2012, then the installation is a bit more complex, so Apple has revealed what hardware you’ll need.

The new documentation from Apple explains which graphics cards are compatible with macOS 10.14 Mojave thanks to their support of Apple’s 3D API (known as Metal).