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Computer Power Consumption. Created By Paul Briskey February 18, 2008. Outline. Computer Power States Computer Power Consumption Factors Notes On Energy Star Power Test – System Configuration Power Test Results Conservation Steps and Software Notes

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Computer power consumption l.jpg

Computer Power Consumption

Created By Paul Briskey

February 18, 2008

Outline l.jpg

  • Computer Power States

  • Computer Power Consumption Factors

  • Notes On Energy Star

  • Power Test – System Configuration

  • Power Test Results

  • Conservation Steps and Software Notes

  • Changing Power Management Settings

  • Sources

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Computer Power Consumption Factors

  • Everything makes a difference

    • Power consumption is based on voltage levels and current requirements. These will vary drastically not only with component attributes (i.e., processor speed), but also between brands.

    • Power management options in the operating system as well as in the motherboard BIOS also change consumption.

  • Performance often precludes power savings

    • Increases in speed result in more power use. For example, an increase in memory speed causes it to become unstable so the memory voltage is increased. This directly results in more power use.

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Notes On Energy StarFor Computers/Motherboards

  • Energy Star is a product certification that manufacturers can apply for.

  • Each product type (desktop, server, etc.) has several categories, each with different qualifications.

  • Compliance is taken very seriously since ONE failed test at any time prohibits certification for the failed product indefinitely.

  • Test conditions are specified by the manufacturer. Therefore, an E-Star compliant system might only pass when specific parts are used and many system options are disabled.

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Power Test – System Configuration

Note: Parts list is not exhaustive. Energy Star configuration for Class C desktop board

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Power Test Results

*E-Star board power requirements are based on the Intel Desktop Class C standard (classes A and B have more stringent power requirements).

**Active Test: Running 3DMark06

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Conservation Steps & Software Notes

To Conserve Energy:

  • Turn your computer off at night. (Basic)

  • Change power management options on your computer. (Intermediate)

  • Disable unnecessary motherboard options. (Advanced)

  • Disable unused hardware in the device manager or set it to enter low power mode when not used. (Advanced)

Using Software:

  • You can download software to change power management options for you. Many systems already include this.

  • If you can do it yourself (it is very straight forward) you will avoid another program running in the background slowing your computer down.

  • This software is not capable of changing any motherboard options in BIOS

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Changing Power Management Settings

1. Right click on the desktop and select “Properties”

3. Select a power scheme and hit OK

2. Select the “Screen Saver” tab and click “Power…”

 Explore this dialogue to find other options for power saving

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Bolioni, Thomas, et al. “Energy Star* System Implementation.” April 2007. Intel Corporation. 18 February, 2008.