In Raphael (the cpus that were just launched) the GPU is a tiny, weak one that's sitting on the IO die, while the v-cache chip is integrated on top of the main

In Raphael (the cpus that were just launched) the GPU is a tiny, weak one that's sitting on the IO die, while the v-cache chip is integrated on top of the main CPU die. I would suspect that it can't make any use of it, not that it would benefit much because it just doesn't have the compute power. It's really only intended to make the CPUs able to do basic desktop work without a separate GPU. AMD currently has no published big APUs that would use v-cache, but many enthusiasts, including me, have noted that if they made one and allowed the GPU to share the last-level cache, it would potentially be a very compelling product for mobile. Who knows when/if they make one. They do have upcoming discrete GPUs which are rumored to optionally contain v-cache (RDNA3, probably released as Radeon RX 7000).