Intel Core i7-5775C: Broadwell for Desktops

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Energy Efficiency

Using discrete graphics, the overall power consumption dynamic evens out between Skylake and Broadwell.

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 i7-5775C is supreme, edging out the i7-6700K by about 1W.

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 i7-5775C trails only the i7-6700K by a mere 0.4 Wh or 5%.

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 i5-4690K would act again as our standard with 100 points.

The i7-5775C and i7-6700K deliver similar levels of energy efficiency but the Skylake chip is somewhat faster, giving it the edge in performance per watt.

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