Sandy Bridge, Part 5: Asus P8P67 and P8P67 Pro Motherboards

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TEST METHODOLOGY

Test Setup:


Asus P8P67 testbed device listing. The Pro version has an Intel gigabit ethernet controller (instead of Realtek) and an additional JMicron controller powering the eSATA ports on the back panel.


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.


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.

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

Comparable motherboards, even from the same chipset, often apply different operating voltages to the CPU which can have a big effect on overall power consumption.

Before we jump into our test results, please note the operating voltages of the processors tested today as sort of a disclaimer. Different samples of the same processor often run at slightly different operating voltages which can affect energy efficiency. Different motherboard models do not apply the exact same core voltage either.



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