DDR5 has basically minor cpus on the RAM for improved performance. That's the main reason why they're so expensive and sometimes need active cooling
It sounds interesting. https://www.bunniestudios.com/blog/?p=3554
Having active cooling, making the system noisier and potentially hotter, seems like a pretty big down side.
https://www.anandtech.com/show/17047/the-intel-12th-gen-core...