Slightly OT, but have you seen https://news.ycombinator.com/item?id=22392160 ?
Wherein he explains something like (up to) "AVX-32768" at about 36 minutes and 30 seconds ( https://youtu.be/5Z7cmyYakAw?t=1594 ) besides the latest AVX-512 with no downclocking whatsover at 2,5GHz.
This is not exactly "In-Memory" but since it's all in the SOC, connected to ring bus with low latency, and large cache...?
All in all very impressive chip, especially when considering the technology they had made their samples in. You can't buy it yet, unfortunately.
https://centtech.com/ai-technology/
They did an AMA on reddit two months ago https://old.reddit.com/r/hardware/comments/ep0lf4/x86_cpu_de...
https://fuse.wikichip.org/news/3099/centaur-unveils-its-new-...
https://fuse.wikichip.org/news/3256/centaur-new-x86-server-p...
Cha, Cha, Cha!