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TEST METHODOLOGY
Common Test Platform:
Intel LGA1156:
Intel LGA1155:
AMD AM3:
- AMD Phenom II X6 1100T Black Edition
processor - 3.3 GHz, 45nm, 125W
- AMD Phenom II X4 975 Black Edition
processor - 3.6 GHz, 45nm, 125W
- AMD Phenom II X4 965 Black Edition
processor - 3.4 GHz, 45nm, 125W
- AMD Phenom II X4 955 Black Edition
processor - 3.2 GHz, 45nm, 125W
- AMD
Phenom II X4 840 processor - 3.2 GHz, 45nm, 95W
- AMD Phenom II X2 565 Black Edition - 3.4 GHz, 45nm, 80W
- Asus M4A78T-E motherboard
- 790GX chipset
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.
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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 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:
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Seasonic SS-400ET Test Results
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DC Output (W)
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21.2
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41.6
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60.2
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81.9
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104.7
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124.1
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145.2
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AC Input (W)
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32.0
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58.0
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78.0
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102.0
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128.0
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150.0
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175.0
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Efficiency
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66.3%
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71.7%
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77.1%
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80.3%
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81.8%
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82.8%
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83.0%
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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. Higher voltages don't necessarily equate to higher power consumption, but in many cases there is a correlation.
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