https://wccftech.com/next-gen-amd-rdna-gaming-gpus-could-include-a-stacked-accelerator-die-on-the-primary-gpu-with-machine-learning-capabilities/

AMD's next-generation RDNA GPUs are getting more technically advanced each iteration and MCM technology is just the start. In a patent published by AMD, the chip maker discusses the addition of a stacked accelerator die on board next-gen GPUs, as discovered by Coreteks.

AMD's MCM solution for GPUs is already using bleeding-edge technology & there are also rumors of next-gen RDNA GPUs featuring 3D Infinity Cache technology in a chiplet-based architecture. The latest rumor is that another technology might be coming to next-gen RDNA GPUs and that is APD or Accelerated Processor Die. Think of it as a die integrated within the main GPU (possibly a stack chiplet), designed to execute machine learning tasks.