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From what I know of the space, ARM is not used very much at all in cars or aviation. These are both areas where PowerPC dominates. I'd guess most modern cars have at least a dozen PowerPC chips.

And both ARM and PowerPC outsel x86 by a hell of a lot more than a factor of 2. It's at least a factor of 10, and that's almost certainly low too. x86, in terms of units sold, is an extremely small market.

You're right, I meant to write PowerPC.

at first, I took factor 10 for a binary joke :)

Not so much in cars and airplanes, but somewhat ironically, a typical x86 pc has many more ARM cores than it has x86 cores. My hard drive has 3 arm cores, my ssd has 2, my sound chip has one, my network chip has one...

More like a factor of 10.