If Apple was "ready" to move to AMD as their Mac family CPU supplier, don't you think would have done it with the Mac Pro 7,1?
No. Because AMD wasn't ready around two years ago.
Folks are judging AMD on being able to "walk the walk , to back up their talk" in 2018 and 2019. Well that wasn't 2017. These products have longer lead times that folks want to account for.
I suspect though at this point that Apple is about as 'done' with Intel's "dog ate my homework" messaging as most of the Mac Pro use base is done with Apple's variation of the same excuse.
https://www.anandtech.com/show/1513...customers-apologizing-for-cpu-shipment-delays
Minimally Apple is lobbing 15-inch cannon shells in the direction of Intel with these zen2 and other support being weaved into macOS at this latest version coming up. That's probably where a major contributor to the "Apple is dumping Intel" reporting over last year or so. ( Plus the being way past pissed off at the Intel modem work too. ).
There wasn't really a good reason to jump to AMD in 2019 if they were going to flake in a similar fashion to Intel 2019. Remember Navi stumbled into a ditch in late 2018 so AMD's record is not spotless. But I suspect Intel just straight up lied to Apple in NDA about just how big the clusterf*ck was with their line up in 2017 time frame.
Intel could have been lining up outsourcing chipset work back in 2016-17 and it would have come online earlier in 2019.
I mean here is a machine that was 30 months from announcement to shipping so that would have been plenty of time for Apple to design it around AMD CPUs and it would have been the model that such a move would have had the most performance impact (vis-a-vis Intel W3000 series Xeons).
Have you looked at the ODM support AMD has done with firmware fixes and what was their Thunderbolt support maturing level 30 months ago. Did the MP 2013 get timely, energy efficient updates for its GPU from AMD? etc. etc. 30 months ago AMD has something that looked good. Was it really actually going to be good deeply untested.
Personally, I see this as just Apple staying current with alternative x86 architectures as a contingency plan should they need to move away from Intel. But I believe they intend to stay with Intel until they move to their own ARM-based chips (which itself will likely be a long staged roll-out).
If LG or Samsung has screwed up on display tech evolution as badly as Intel has screwed up on CPU upgrades over the last 2 years do you really still think they'd be top list Apple suppliers in displays at this point? I suspect Apple has been hoping Intel would clean up their mess. Yanking away the modem division was serious warning #1. I imagine Apple is pretty close to pulling the trigger on at least one Mac model at this point. That would be more than serious warning #2.
The Mac Mini would be a good candidate. It isn't super critical to the product mix and not high volume if have to tack back to Intel in 12 months. The comatose 21.5" "education" model would be another.
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What upgrade path do you have with Intel's dead platform, anyway?
Current design gives you just an illusion of upgradeability. Those 28 core CPUs are top of the line you will ever get on this platform, anything else Intel will release in future will require new Socket, new MoBos, or - will be BGA. ...
So does AMD Threadripper. The recently introduced models are pragmatically a new socket. There was a new socket on both paths so it isn't materially different Intel or AMD in that respect.
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I don't think Apple's exclusivity agreement with Intel has ended yet. Or if it has, just barely.
Thunderbolt is a principle strategic direction for Macs. A few years ago AMD was trying to subvert Thunderbolt. Intel didn't need any exclusivity agreement. AMD was shooting themselves in the foot.
Apple was working together in a highly collaborative manner. It doesn't seem likely that some Intel contract made them do that. That isn't very apple-ish ( we'll do whatever you tell me to do mr. component supplier. ) . Qualcomm and Samsung have tended to get "screw you" types of response when suppliers tried to play that hand. Nvidia appears to be in the boat too.