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Power Usage Benchmarks

Battle At £105: Can An APU Beat An Intel CPU And Add-In Graphics?
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With the performance story fairly well covered, we turn our attention to evaluating power consumption. The A8-3870K has a 100 W TDP, and the Pentium G620 and Radeon HD 6670 combination comes close, too.

At idle, the stock APU uses less power than our host/graphics processor combo. Additionally, the less-complex Radeon HD 6550D GPU is more energy-friendly under load than the discrete card. Crank up the processor, though, and AMD's four cores consume significantly more power than Intel's two. With both a graphics and host processor load applied, the results are similar.

Overclocking doesn't do AMD's solution any favors. A combination of higher voltage and elevated clock rates push system power consumption up significantly at idle, yes. But the 100+ W jump under a mixed graphics/processing load is particularly disappointing.

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