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System idle power is probably one of the most important results if you intend to run your machine 24x7. A low idle power translates directly into lower energy costs, as well as lower system temperatures.
In our testing, we enabled all power saving mechanisms, so the AMD system took advantage of Cool’n’Quiet, while the Intel system used Enhanced SpeedStep and all of its deeper C-states to reduce power during idle. Nevertheless, more cores for AMD translates into higher idle power. It takes AMD’s lowest-power processors to even get close to Intel’s power consumption levels, which are reached without any extra optimization.
Peak power depends on the processor's TDP rating. The AMD CPUs that stay within 25 W and 45 W TDP remain at low power levels. A 50 W peak power on the Athlon II X2 260u is impressive. Intel’s processors are extremely low on idle power, but they require more power when operating at peak loads. Yet, this combination could be ideal to dominate the efficiency tests.