Runtime Power Management, v 1.0

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Runtime Power Management

v1.0

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

What is EIST? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

What is Cool’n’Quiet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Why are EIST and Cool’n’Quiet needed? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

What are the required components for EIST and Cool’n’Quiet to function? . . . . . . . . . . . . . . 2

How will EIST and Cool’n’Quiet impact HP Customers? . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Advantages of using EIST/Cool’n’Quiet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Disadvantages of using EIST/Cool’n’Quiet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Known Issues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Resources for EIST and Cool’n’Quiet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Frequently Asked Questions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Summary of content (11 pages)

PAGE 1
Runtime Power Management v1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 What is EIST? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 What is Cool’n’Quiet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Why are EIST and Cool’n’Quiet needed? . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 2
Introduction Computer processor manufacturers are incorporating the ability to manage power use directly into their newer processors. Processors recently released by both Intel and AMD include features that work with the BIOS and operating system to lower power consumption. Along with being more environmentally friendly, reduced power consumption results in reduced heat production. Less heat means lower fan speed requirements, thereby providing quieter, more efficient computers.
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Processor Intel’s 600 and 800 series processors support EIST. AMD’s Athlon 64 line of processors support Cool’n’Quiet. Both technologies may become a standard feature for future processors. Chipset EIST requires the Intel 915 or later chipset.
PAGE 4
For processors that support both EIST and TM2, CPU throttling is controlled by EIST and the operating system. The HP BIOS controls CPU throttling on TM2-only processors, resulting in support for RTPM. See “Known Issues” on page 9 for possible compatibility issues. There is no RTPM capability for processors that do not support EIST or TM2. You can enable or disable the AMD Cool’n’Quiet option in the BIOS of the HP dx5150. This option is located in F10 Setup in the Power Management Options section.
PAGE 5
Power Management Scheme EIST will function only if the operating system is using an adaptive power management scheme. The following table shows the relationship between power scheme and the control policy used.
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Home/Office Desk in default state Home/Office Desk in adaptive state 6
PAGE 7
System Properties - EIST The System Properties window displays current processor speed on computers installed with an EIST-capable processor and Windows XP Service Pack 2 that are using an adaptive power scheme. The following images illustrate a drop in processor speed for an Intel Pentium 4 system (3.4 GHz) under throttled conditions with EIST both enabled and disabled.
PAGE 8
System Properties - Cool’n’Quiet The System Properties window displays current processor speed on computers installed with a Cool’n’Quiet-capable processor and Windows XP Service Pack 2 that are using an adaptive power scheme. The following images illustrate a drop in processor speed for an AMD Athlon 64 3800+ system (2.4-GHz) under throttled conditions with Cool’n’Quiet enabled and disabled.
PAGE 9
Advantages of using EIST/Cool’n’Quiet Enabling EIST/Cool’n’Quiet provides the following benefits: • Increased power savings. • Lower operating costs. • Less heat production. • Potential for less noise from slow fan speeds. Disadvantages of using EIST/Cool’n’Quiet There are no known disadvantages to using EIST/Cool’n’Quiet if you use the latest HP BIOS and/or the latest service packs for Microsoft operating systems.
PAGE 10
Resources for EIST and Cool’n’Quiet The following web sites provide additional information about EIST and Cool’n’Quiet. http://www.intel.com/cd/channel/reseller/asmo-na/eng/products/box_processors/desktop/ proc_dsk_p4/technical_reference/203838.htm http://www.amd.com/us-en/Processors/ProductInformation/0,,30_118_9485_9487%5E10272,00.html http://www.amd.com/us-en/Processors/TechnicalResources/0,,30_182_871_9706,00.
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Q: Does the integration of this functionality imply that the processor speeds available are really too great for standard needs? A: No. This functionality simply provides more flexibility when you use applications that require less processor performance. Today’s world constantly offers more applications that require greater processor performance. And while you may use these resource-intensive applications, you will likely also use applications, such as email, that do not require full processor capability.