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TEST METHODOLOGY
Test Setup:
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Test configuration device listing.
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Measurement and Analysis Tools
Video Test Suite
1080p | 24fps | ~22 mbps |
H.264/MKV: A custom 1080p H.264 encoded clip inside an Matroska container.
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1080p | 24fps | ~2.3 mbps |
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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 the CPU, we
use either Prime95 (large FFTs setting) or CPUBurn depending on which produces higher system power consumption. After 10~15 minutes of load (when temperatures stabilize), we also measure the hottest points on the external heatsinks using an infrared thermometer. To stress the IGP, we use FurMark, an OpenGL benchmarking and stability testing utility.
Finally, storage subsystems are tested briefly using CrystalDiskMark (1000 MB of 0x00 fill test data) and a Kingston HyperX 3K 120GB solid state drive. For USB and eSATA we use an external eSATA/USB 3.0 dock to connect the drive.
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