Pairing a big fast processor with a small energy-efficient processor is starting to get more common. You see it in a lot of higher end Android phones. I believ

Pairing a big fast processor with a small energy-efficient processor is starting to get more common. You see it in a lot of higher end Android phones. I believe that the Touch Bar Macbooks also pair an x86_64 processor with an ARM coprocessor that runs the touch bar.