Sandy Bridge, Part 4: Core i5-2400, i5-2500K and i7-2600K CPUs

CPUs|Motherboards
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TEST METHODOLOGY

Common Test Platform:

Intel LGA1156:

Intel LGA1366:

Intel LGA1155:

AMD AM3:

Measurement and Analysis Tools

Timed Benchmark Test Details

  • NOD32: In-depth virus scan of a folder containing 32 files of varying size with many RAR and ZIP archives.
  • WinRAR: Archive creation with a folder containing 68 files of varying size (less than 50MB).
  • iTunes: Conversion of an MP3 file to AAC.
  • TMPGEnc: Encoding a XVID AVI file with VC-1.
  • HandBrake: Encoding a XVID AVI file with H.264.
  • Photoshop: Image manipulation using a variety of filters, a derivation of Driver Heaven's Photoshop Benchmark V3 (test image resized to 4500x3499).

1080p | 24fps | ~14mbps

x264 1080p: Spaceship is a 1080p x264 clip encoded from the Blu-ray version of an animated short film. It features a hapless robot trying to repair a lamp on a spaceship.

Testing Procedures

Our main test procedure is a series of benchmarks, timed tests of real-world applications. System power consumption (AC) is measured with a Seasonic Power Angel during these tests (an average of the first 10~15 seconds) as well as at idle, during playback of a 1080p H.264 encoded clip, and during full CPU load. To stress the CPU we use either Prime95 (large FFTs setting) or CPUBurn depending on which produces higher system power consumption. The AC system power is then later converted to DC.

Certain services and features like Superfetch and System Restore are disabled to prevent them from affecting our results. Aero glass is left enabled if supported. We also make note if energy saving features like Cool'n'Quiet and SpeedStep do not function properly.

Estimating DC Power

The following power efficiency figures were obtained for the Seasonic SS-400ET used in our test system:

Seasonic SS-400ET Test Results
DC Output (W)
21.2
41.6
60.2
81.9
104.7
124.1
145.2
AC Input (W)
32.0
58.0
78.0
102.0
128.0
150.0
175.0
Efficiency
66.3%
71.7%
77.1%
80.3%
81.8%
82.8%
83.0%

This data is enough to give us a very good estimate of DC demand in our test system. We extrapolate the DC power output from the measured AC power input based on this data. We won't go through the math; it's easy enough to figure out for yourself if you really want to.

Operating Voltages

Before we jump into our test results, please note the operating voltages of the processors tested today as sort of a disclaimer. Different samples of the same processor often run at slightly different operating voltages which can affect energy efficiency. Different motherboard models do not apply the exact same core voltage either.



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