Intel Core i7-6700: Skylake i7 at 65W

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Energy Efficiency

Using discrete graphics, Skylake loses some of its power consumption advantage compared to when running on integrated graphics, but it still holds a lead over Haswell.

For users with balanced workloads, we've determined what we call the "average power consumption" which assumes the system is used half the time for light load activities (an average of idle and H.264 playback) and the remaining half for heavy load (an average of the power consumption used running our six benchmarks). We believe this is a very common usage pattern for an average PC — they are often left on for long periods of time, doing little to no work.

In this scenario, the i7-6700 is king, beating out the i7-5775C by 2.6W.

For users with heavy workloads, the total power consumed while running our benchmark suite is of pertinent interest. The total power takes into account the energy efficiency of each CPU while running our benchmark tests as well as how quickly they complete each task. This simulates the power draw of a machine that is purely for doing work and shuts down when its job is finished.

As a total workhorse processor, the i7-6700 reigns supreme again but only by 0.1 Watt-hours over the i7-6700K.

To determine performance per watt, we took our relative CPU performance figures and divided it by the "average" power consumption calculated earlier and adjusted the scale so the i7-6700 would act again as our standard with 100 points.

When taking both speed and power consumption into consideration, the i7-6700 is a 1%t favorite over the i7-6700K. It's a slower chip but ultimately a tad more efficient overall.

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