[ChuckNorris89]

Aero industry moves at a very slow pace. The state of the art F-22 Raptor uses intel 386 cpu and the F-35 lightning upgraded to more "modern" PowerPC CPUs, similar to the ones on legacy Macs.

Planes don't need insane multitasking processing power like our smartphones or PCs. They mostly do signal processing and sensor fusion in a tight loop which is quite trivial even for legacy CPUs as it's basic flight math equations which results in highly optimized code.

In terms of aero chips, basic is always better as you want a silicon that's tried and tested for decades to have a deep understanding of it's quirks and bugs so you know the code execution is reliable.