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TEST METHODOLOGY
Test Setup:
- Intel Core i3-2100 processor
- 3.1GHz, 32nm, 65W, integrated GMA HD 2000 graphics
- Intel Core i5-2500K processor
- 3.3GHz, 32nm, 95W, integrated GMA HD 3000 graphics
- Scythe Kabuto
CPU cooler
- OCZ Platinum Extreme Low Voltage memory - 2x2GB, DDR3-1333
- Western
Digital Scorpio Blue notebook hard drive - 500GB, 5400RPM,
8MB cache
- Asus
BC-1205PT Blu-ray drive - SATA
- Seasonic
SS-400ET ATX power supply
- Microsoft
Windows 7 operating system - Ultimate, 64-bit
- Intel
GMA 15.21 graphics driver
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Intel DH67BL and i3-2100 testbed device listing.
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Asus P8H67-M EVO and i5-2500K testbed 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.
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, a note about operating voltages. On some LGA1156 H55 motherboards, we noticed a wide variation in operating voltage that had a big effect on overall power consumption. On these pair of H67 boards, the voltages reported by CPU-Z were much closer together, so this likely is not the cause of any significant differences in energy efficiency.
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Avg. CPU Voltage (according to CPU-Z)
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Motherboard
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Core i3-2100
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Core i5-2500K
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Idle
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Load
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Idle
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Load
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Intel DH67BL
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0.912V
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1.160V
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0.888V
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1.200V
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Asus P8H67-M EVO
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0.928V
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1.152V
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0.888V
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1.192V
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Asus P8H67-M EVO (EPU on Auto)
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0.872V
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1.088V
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0.832V
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1.128V
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