It doesn't even need to be high speed. A minimal chip would have four pins: VCC, GND, TX, and RX. Even one-dollar microcontrollers can handle megabit-speed serial connections, which is fast enough for LLM communication.

Probably more like either USB sidecar or PCIe drop in. I dont think theyll return to a world dedicated coprocessors.

Unless someone finds a way to turn these thijgs into a bios module.