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TEST METHODOLOGY
Test Setup:
- Intel Core i5-2500K processor
- 3.3GHz, 32nm, 95W, integrated HD 3000 graphics
- Intel Core i7-3770K processor
- 3.5GHz, 22nm, 77W, integrated HD 4000 graphics
- Scythe Kabuto
CPU cooler
- Kingston HyperX LoVo 4GB memory 2x2GB, DDR3-1600 @ 1333 MHz, 9-9-9-24
- Western
Digital Scorpio Blue notebook hard drive - 500GB, 5400RPM,
8MB cache
- Asus
BC-08B1ST Blu-ray drive - SATA
- Seasonic
SS-400ET ATX power supply
- Microsoft
Windows 7 operating system - Ultimate, 64-bit
- Intel
HD 8.15 graphics driver
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Test configuration device listing.
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Measurement and Analysis Tools
Video Test Clip
1080p | 24fps | ~22mbps |
H.264: Crash is a 1080p x264 clip encoded from the
Blu-ray version of an science fiction film. It features the aftermath
of a helicopter crash. It has an unusually high bitrate for video of this type.
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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.
Testing Procedures
If available, the latest motherboard BIOS is installed prior to testing. Certain services/features
like Indexing, Superfetch, System Restore, and Windows Defender are disabled
to prevent them from causing spikes in CPU/HDD usage. We also make note if energy
saving features like Cool'n'Quiet/SpeedStep or S3 suspend-to-RAM do not function
properly. If a WiFi adapter is present, it is disabled unless the system lacks wired ethernet.
Our main test procedure is designed to determine the overall system power consumption
at various states (measured using a Seasonic Power Angel). To stress CPUs we
use either Prime95 (large FFTs setting) or CPUBurn depending on which produces higher system power consumption. To stress the IGP, we use FurMark, an OpenGL benchmarking and stability testing utility. Power consumption during playback of high definition video is also recorded.
Operating Voltage
Before we start, we present the operating voltages of our Core i5-2500K provided by some of the motherboards compared today. Higher voltages don't necessarily equate to higher power consumption, but in many cases there is a correlation.
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