Cellphones are small and need to make sacrifices for temperature regulation and battery conservation. As beefy as the A9X is could a simple non X chip over power the iPad Pros Processor ? I am going to say no because the iPhone 7's A10 will be clocked slower to account for battery efficiency and smaller size of course. So I am going to guess no. What evidence is there ? I have not looked up the benchmarks but I think the A8X was surpassed in a few months by the A9. I hope not.