Those 192GB aren't unified memory though. 128GB on Mac or 395 can be used by both CPU and GPU. It's the GPU + large memory that opens up fast local LLM inteference.

Yeah, those aren’t. But if we had the ability to buy that much RAM in the laptop then everyone would be looking in that direction. Until this thing discussed here comes to the market, “we didn’t have computers with unified 128GB RAM either” (except of macs).