Gigabyte MA785GPMT-UD2H 785G Motherboard

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TEST METHODOLOGY

Test Setup:


Testbed device listing.


Measurement and Analysis Tools
  • CPU-Z to monitor CPU frequency and voltage.
  • CPUBurn K7 processor stress software.
  • Prime95 processor stress software.
  • FurMark stability test to stress the integrated GPU.
  • Cyberlink PowerDVD to play video.
  • SpeedFan to monitor temperature and fan speeds.
  • Seasonic Power Angel AC power meter, used to measure the power consumption of the system.
  • Custom-built, four-channel variable DC power supply, used to regulate the CPU fan speed.

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 K7 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.

Our main video test suite features a variety of 1080p H.264/VC-1 encoded clips. The clips are played with PowerDVD and a CPU usage graph is created by the Windows Task Manger for analysis to determine the approximate mean CPU usage. High CPU usage is indicative of poor video decoding ability on the part of the integrated graphics subsystem. If the video (and/or audio) skips or freezes, we conclude the board's IGP (in conjunction with the processor) is inadequate to decompress the clip properly.

If available, the latest motherboard BIOS was installed. Cool'n'Quiet was enabled (unless otherwise noted). The following features/services were disabled during testing to prevent spikes in CPU/HDD usage that are typical of fresh Vista installations:

  • Windows Sidebar
  • Indexing
  • Superfetch

Video Test Suite


1080p | 24fps | ~10mbps
H.264: Rush Hour 3 Trailer 1 is a H.264 encoded clip inside an Apple Quicktime container.


1080p | 24fps | ~8mbps
WMV-HD: Coral Reef Adventure Trailer is encoded in VC-1 using the WMV3 codec commonly recognized by the "WMV-HD" moniker.


1080p | 24fps | ~19mbps
VC-1: Drag Race is a recording of a scene from network television re-encoded with TMPGEnc using the WVC1 codec, a more demanding VC-1 codec.


1080p | 24fps | ~33mbps
Blu-ray: Disturbia is a short section (chapter 4) of the Blu-ray version of Disturbia, the motion picture, played directly off the Blu-ray disc. It is encoded with H.264/AVC.


1080p | 24fps | ~36mbps
Blu-ray: Becoming Jane is a short section (chapter 7) of the Blu-ray version of Becoming Jane, the motion picture, played directly off the Blu-ray disc. It is encoded with VC-1.

Estimating DC Power

The following power efficiency figures were obtained for the Seasonic SS-400ET used in our test system:

Seasonic SS-400ET Test Results
DC Output (W)
21.2
41.6
60.2
81.9
104.7
124.1
145.2
AC Input (W)
32.0
58.0
78.0
102.0
128.0
150.0
175.0
Efficiency
66.3%
71.7%
77.1%
80.3%
81.8%
82.8%
83.0%

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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