2015 MacBook: Core M, M-5Y51, TDP 4.5 W (Broadwell)It's a shame that Apple killed the 12" MacBook.
2016 MacBook: Core m5, 6Y54, TDP 4.5 W (Skylake)
2017 MacBook: Core m5, 7Y54, TDP 4.5 W (Kaby Lake)
2018 MacBook Air: Core i5, 8210Y, TDP 7 W (Amber Lake)
2019: Core i5, 1030G5, TDP 9 W (Ice Lake)
The 12" MacBook chassis was designed for 4.5 W TDP. The retina MacBook Air for (at least) 7 W TDP. Those Ice Lake Y-series chips really might not fit into the no-fan 12" MB body thermally.
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They didn't kill it, they've just added a TouchBar (and TouchID). It still uses the same class of processors as the non-TB 13" MBP, still has the same two TB ports and still has the same internal layout (which is different from the 4-TB port 13" MBP).It's a shame that Apple killed the non-TouchBar 13" MacBook Pro.
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Given that Apple had offered a MacBook without TB for four years, why couldn't they release an ARM-based laptop that, like the iPad Pro only comes with USB-C ports? And once we discard TB, what other "caches, memory controllers, PCIe and other stuff" would a MacBook need that are not in an iPad Pro today?What makes you think an A series processor, once you add the caches, memory controllers, PCIe and other stuff will have a lower TDP.
Comparing an A series processor with an Intel i7 is an oranges to bananas comparison.
Once there is a real laptop version of an A series processor, only then can you make a comparison.
The high speed analog I/O and serdes required for PCIe and thunderbolt consume lots of power.
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