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TEST METHODOLOGY
Common CPU Test Configuration:
AMD AM3:
AMD AM3+:
Intel LGA1155:
Intel LGA2011:
- Intel Core i7-3960X
processor - 3.3 GHz, 32nm, 130W
- Intel DX79SI motherboard
- X79 chipset
- Kingston HyperX LoVo 4GB memory - 2x2GB, DDR3-1600 @ 1333 MHz, 9-9-9-24
- Corsair
XMS3 memory 2x2GB, DDR3-1600 @ 1333MHz, 9-9-9-24 (combined with Kingston kit for quad channel operation)
- Intel RTS2011LC liquid CPU cooler - stock fan/pump at 800RPM
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).
Video Test Clip
1080p | 24fps | ~22 mbps |
H.264/MKV: A custom 1080p H.264 encoded clip inside an Matroska container.
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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.
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.
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