Where has it been confirmed that next-gen Xbox is using AMD?
All that's been said so far of the next-generation Xbox is that MS believes the next-gen Xbox will be the most powerful console box(the same way they declared X to be the most powerful console box, which turned out to be true).
And even if they are using the same AMD technology, both consoles will not have the same capabilities(current gen shows massive performance differences between hardware comparing PS4 Pro and Xbox One X despite using similar AMD tech).
Anybody would have told you that coming one year later at $100 more would net you a more powerful system. This is not a trend with MS, its was an expectation,perhaps even an expectation at $400 1 year later, but even that was not reality. All told, a system missing Vega features and lacking in Custom engineering mind you compared to the system released 1 year earlier.
For your knowledge, there has never been a time where MS has launched in the same timeframe as Sony and had better hardware.....even the differences in the PRO vs XBONEX 1 year later at a markup, suggests this as well....
I think people need to reign in their expectations a bit. I remember similar talk about the PS4 being a monster, when in fact it was a lot weaker than people were expecting. These things are in small cases and have to fit under an entertainment center without overheating. Price is also a limiting factor.
If anything, the opposite happened. Queue some old threads on GAF when there was speculation on PS4's 8GB of Ram, it's the same sentiment you get in this thread by and large. People thought persons were on drugs, it would be impossible et al.....
Look at this conversation now, folk are still imagining current systems and architectures with higher TF counts and basing next gen expectations or lack thereof based on that, so hence their disbelief on how said systems will be cooled etc....In truth, a PS5 in 2020 may even be based on 7nm+ or even 5nm, so a a much reduced power draw on top of new architecture or new hardware cores that offsets how things are traditionally rendered (raytracing is one, maybe even specific hardware for A.I).....
In essence, looking at current Vega AIO powerdraw at 13.7TF does not paint an accurate picture of how powerful or power efficient we can get 18-24TF in 2020 under new architecture at 7nm or 5nm. Things evolve, nodes are getting more compact, coolers are getting much better, processes are getting better. Current Vega architecture should not be used as a measuring stick to tell the future in the face of many evolving technologies.
Even Vega is going through some changes which will improve perf at a much lower powerdraw, Vega 7nm is already a thing and we can expect 20.9TF or more with it this year.....The NUC's in early 2019 will be very powerful on 7nm, so I don't see how persons believe that a PS5 in late 2020 is only going to have 16GB of ram or push only 10-12TF. If Vega 7nm is pushing north of 20+TF this year or early next year, then Navi will push much more than that when it launches....Even a mid gen Navi GPU should be 24TF at minimum in 2020...