excellent comment
i knew that most likely some one was going to bring in the emulation topic
i had it the whole time in the back of my head but i didn’t mentioned
but if we don’t go by emulation and we use benchmarks or real workload then we will get back to square one or in this case back to my comment about performance
yes those devices are good and very capable but they are not as fast as a high end pc. where you can put a video card and do gpu encoding, we all know what happened to nvidia and cuda in mac os thanks to apple
this is where i’m going
the comment that mr cook made about an ipad replacing a pc
well maybe an avg or below the avg pc but never a high end pc , specially one with many cores that can do encoding or reendering much faster than an ipad
please don’t get the wrong idea , i’m not a hater or anything like that
lol
is just that an old computer with and old cpu can run leopard just fine, the only impresive thing here is an ipad running mac os
but unfortunately leopard is a bit too old
it will be much better if the ipad is able to run a newer version of mac os, anything after yosemite
And here we go again

Current A-series processors have enough raw power to somehow compete with 13" MBP. So, going back to my previous comment, you can scale this processor to reach the same TDP and then have a high-end CPU with enough power to do anything your CPU can.
x86 architecture is heavily overloaded with rudimentary instructions and it takes more time to perform the majority of the modern tasks than ARM that's much younger and has less unneeded stuff.
And again, Leopard is too old, but there are more difficulties with emulation than with the performing modern tasks on an ARM processor. Just to make it clear, A13 is 6W chip (according to some website I found on the internet

) and it's pretty powerful for anything you can imagine in terms of mobile tasks. When you go to the desktop performance with desktop-level cooling solutions, take this CPU, scale it to have much more transistors and cores so it matches your perfect high-end CPU. Even if it won't be as powerful (I doubt it wouldn't), you need to keep in mind that ARM is evolving with insane speed and in nearest future, I don't see a reason not to replace current architecture with a more modern one.