[tyingq]

The TI AM335x CPU has something (sort of) like this...basically 2 microcontrollers that share memory with the ARM cpus.

People have done some pretty clever things with it. Audio processing, driving LED matrix boards, emulating old video boards, driving precision servos, software oscopes and logic analyzers, etc.

Though that's in a small dev board, like the Beaglebone Black, not a beefy Intel server.