Shortly after Apple announced the Mac Pro desktop earlier this week, AMD said that it is introducing two new Vega 20 cards for workstation users — the Radeon Pro Vega II and the Radeon Pro Vega II Duo targeted at high-compute workloads. The Radeon Pro Vega II Duo is the world's most powerful GPU at the moment with an FP32 performance of 28.3 TFLOPs. Sadly though, this GPU is only available to the Mac Pro and it will be some time before gamers can reap the benefits of Infinity Fabric on GPUs.
https://www.notebookcheck.net/AMD-Radeon-Pro-Vega-II-Duo-displaces-the-NVIDIA-Titan-RTX-to-become-the-world-s-most-powerful-GPU-but-don-t-expect-to-game-on-it-anytime-soon.423036.0.html