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One thing to note, x86 is known for being spectacularly inefficient for mobile workloads. It's not magic that makes an ARM CPU more efficient, it's just different design considerations. For an example of this, check out the Intel Atom line of processors[0] which were mostly x86 processors but designed to be mobile and power sipping. Whether they were successful at that, or in terms of performance, I'm not sure. But they get down to single digit TDP, which is how many watts of power you can expect one to use while under load.

[0]https://en.wikipedia.org/wiki/Intel_Atom




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