It's all just dumbed down marketing speak for "heterogeneous multiprocessing." There's nothing preventing it from being on the same die, either. The fact that

It's all just dumbed down marketing speak for "heterogeneous multiprocessing." There's nothing preventing it from being on the same die, either. The fact that it's a coprocessor just means that it's a separate processing core which the main (general purpose) processing cores must communicate with through a bus. It could even be clocked synchronously with the general purpose cores and it wouldn't matter.