[magila]

It's not just about clock speed. While Intel Core CPUs don't scale down to power budgets as low as ARM cores, they are impressively efficient on a perf/watt basis. Smart phones achieve high battery life mostly by being very aggressive about reducing CPU load in software (see iOS killing apps the moment they go into the background). General purpose operating systems don't work like that so there's more reliance on the hardware to keep power draw down.

[Redoubts]

they are impressively efficient on a perf/watt basis

Is that true? I thought people were trying out ARM rack servers because of the power efficiency vs perf.

[magila]

The key word there is "trying". ARM servers have had a tough time gaining traction in no small part because the hoped for power efficiency gains have not been realized.

[flamedoge]

sounds like Intel hit a pretty sweet work/watt by increasing work while keeping lid on wattage. ARM delivers battery life by lowering work.

[pertymcpert]

No that's not how it works at all. ARM has always been power efficiency focused.