DDR5 is pretty crazy. Just recently that was GPU memory. I can't help but wonder what DDR5 could mean for APUs. If DDR5 for desktop is fast enough, is there any reason that a motherboard couldn't have two sockets; one for CPU and one for GPU? Imagine an upgradeable GPU that drops into your motherboard? It has to happen. Tell me it's stupid and I'll say YOUR STUPID.
Never seen GPUs use DDR5.
ADL integrated graphics is probably the first GPU to ever use DDR5.