However, there appears to be a difference in size of the two A9s which might play a role in how the iPhone performs…
Samsung’s A9 with product number APL0898 at 96mm appears to be 10% smaller than TSMC’s AAPL1022, which is 104.5 mm. That could mean that Samsung’s is built on a smaller die size and is perhaps more energy efficient than the TSMC version.
Apple has run into issues with two separate OEMs before. Apple puts both Samsung and Toshiba SSDs in their MacBooks but Samsung’s often perform much better than Toshiba’s on read/write tests.
Chipworks continues to investigate how small the die is and if there are any performance differences between the two chips, so stay tuned.