Here's the Anandtech article on the "few" tweaks Samsung has made to its 6 wide decode custom M3 cores in the upcoming Exynos 9810.
https://www.anandtech.com/show/12361/samsung-exynos-m3-archi...
Looking back, it makes sense that Qualcomm discarded their underperforming custom design efforts (at least for the mobile market). If ARM can deliver a competitive design, why not fully commit to their roadmap and save significant amounts on R&D costs?
I sometimes wonder how much of It Just Works was influenced by having slower machines. When doing everything takes longer, if you do it right the first time then it’s still faster than doing it twice.
The other license is getting ARM's implementation of a CPU (ie A57, A72 etc). Customers can parametize # cores, cache size, memory width etc, but the basic architecture is fixed.
https://en.m.wikipedia.org/wiki/Advanced_Microcontroller_Bus...
Secondly theres a large ecosystem of add on components designed work with ARM and be dropped into ARM SOCS, such as GPUs, Wifi modules, Gyroscopes, wireless modems, GPS, etc.
Thirdly there are a lot of SOC engineers very familiar with ARM. You can hire them streight from competitors, or college, including PHDs that have done research on it. Youd need to train up any new hirs from scratch on your architecture.
Finally theres a huge software development tool chain built around the established processor architectures. To support a new architecture youd also need to build a set of compiler back ends, bearing in mind the existing ones benefit from many years of tweaking and optimization.
I think both these metrics are now adequate, battery life is the single metric I am interested in now.
The counter argument is that the other systems make up for this by having more cores, which is really a cop out. Single threaded execution has a far more direct effect on user experience, gaming performance, etc. They can't compete in core engineering so make it up by slapping on more fairly generic cores. It does appear that Samsung is responding to this and investing in more advanced core designs.
The final area is custom features like the neural engine behind real-time face recognition, real time 3D face lighting effects and such. The competition don't really have these at all, so we don't know how far behind they are.
There's a pretty good article on this linked below.
https://seekingalpha.com/article/4138071-apple-cpu-advantage...