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You Cant Scale a Server/Desktop CPU two step down into Mobile Devices.

This is what Atom is all about, the higher power/performance x86 possible.

And You also cant scale a Mobile Devices up to a Server / Desktop Product.

That is what the ARMv8 Cortex A58 is all about, Low Power Desktop and Server Class.

So technically speaking both are marching towards each others end. Although Intel would lose out due to other factor such as business model.