There are definitely some features omitted from Apple's GPU, but fairly early in the reverse engineering process, Alyssa Rosenzweig provided several examples of

There are definitely some features omitted from Apple's GPU, but fairly early in the reverse engineering process, Alyssa Rosenzweig provided several examples of hardware features present in Apple's GPU that are not exposed by Metal: https://rosenzweig.io/blog/asahi-gpu-part-4.html https://rosenzweig.io/blog/asahi-gpu-part-4.html