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The first ARM-based Windows 10 PCs are due to be released soon.

https://www.theverge.com/2017/5/31/15711334/microsoft-window...

http://www.zdnet.com/article/windows-10-on-arm-hps-leak-hint...

ARM-based Windows machines already exist -- https://en.wikipedia.org/wiki/Surface_(2012_tablet)

They worked out well

MS has x86 working on ARM however: http://www.zdnet.com/article/microsofts-x86-on-arm64-emulati...

Technically there already is one - the Touchbar is controlled by a dedicated ARM co-processor.

There was a report on MacRumors [1] (yes, so take it with a grain of salt) that the iMac Pro is likely to ship as an A10 Fusion + Intel Xeon.

The A10 would apparently be 'always-on' for things like "Hey Siri", and would actually handle the boot process, passing the EFI firmware for the Xeon to boot with.

https://www.macrumors.com/2017/11/19/imac-pro-a10-chip-hey-s...