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Encyclopedia > SpeedStep
SpeedStep has lowered this Pentium 4's Clock Speed from 3Ghz to 2.4Ghz

SpeedStep is a trademark for a series of technologies (including SpeedStep, SpeedStep II, and SpeedStep III) built into some Intel microprocessors that allows the clock speed of the processor to be dynamically changed by software. Image File history File links No higher resolution available. ... Image File history File links No higher resolution available. ... The Pentium 4[1] brand refers to Intels mainstream desktop and mobile single-core CPUs (introduced on November 20, 2000[2]) with the seventh-generation NetBurst architecture, which was the companys first all-new design since the Intel P6 of the Pentium Pro branded CPUs of 1995. ... “(TM)” redirects here. ... Intel Corporation (NASDAQ: INTC, SEHK: 4335), founded in 1968 as Integrated Electronics Corporation, is an American multinational corporation that is best known for designing and manufacturing microprocessors and specialized integrated circuits. ... A microprocessor is a programmable digital electronic component that incorporates the functions of a central processing unit (CPU) on a single semiconducting integrated circuit (IC). ... In synchronous digital electronics, such as most computers, a clock signal is a signal used to coordinate the actions of two or more circuits. ...

Contents

Explanation

Running a processor at high clock speeds allows for better performance. However, when the same processor is run at a lower frequency, it generates less heat and consumes less power. In many cases, the core voltage can also be reduced, further reducing power consumption and heat generation. This can conserve battery power in notebooks, extend processor life, and reduce noise generated by variable-speed fans. By using SpeedStep, users can select the balance of power conservation and performance that best suits them, or even change the clock speed dynamically as the processor burden changes. The CPU core voltage (VCore) is the power supply voltage supplied to the CPU (which is a digital circuit). ...


For example, a Pentium M processor marketed at 1.5 GHz can run at speeds between 600 MHz and 1.5 GHz, in 300 MHz increments using SpeedStep III. Older processors, using older versions of the SpeedStep technology, have fewer increments, such as the Pentium 4-M. For example, a 1.7 GHz Pentium 4M can run at 1.6 GHz, at 1.2 GHz, and at 786 MHz. Introduced in March 2003, the Pentium M is an x86 architecture microprocessor designed and manufactured by Intel. ... The Pentium 4[1] brand refers to Intels mainstream desktop and mobile single-core CPUs (introduced on November 20, 2000[2]) with the seventh-generation NetBurst architecture, which was the companys first all-new design since the Intel P6 of the Pentium Pro branded CPUs of 1995. ...


SpeedStep technology is partly responsible for the reduced power consumption of Intel’s Pentium M processor, part of the Centrino brand. Components of the Centrino platform. ...


Operating system support

Under older Microsoft Windows operating systems, including Windows 2000 and previous versions, a special driver and dashboard application were needed to access the SpeedStep feature. Intel's website specifically states that such drivers must come from the computer manufacturer; there are no generic drivers supplied by Intel which will enable SpeedStep for older Windows versions if one cannot obtain a manufacturer's driver.[1][2] Windows 2000 (also referred to as Win2K) is a preemptive, interruptible, graphical and business-oriented operating system that was designed to work with either uniprocessor or symmetric multi-processor 32-bit Intel x86 computers. ...


In contrast, AMD continues to supply and support drivers for its competing PowerNow! technology that will work on Windows 2000, ME, 98, and NT.[3][4] PowerNow! is a feature of AMDs K6-2+, K6-III+, mobile Athlon, and Turion 64 processors used in laptops. ...


Linux has full SpeedStep support already integrated in the kernel and, under Microsoft Windows XP, SpeedStep support is built into the power management console under the control panel. In Windows XP a user can regulate the processor's speed indirectly by changing power schemes. The "Portable/Laptop" power scheme enables SpeedStep, while "Home/Office Desk" disables SpeedStep. This article is about operating systems that use the Linux kernel. ... Windows XP is a line of operating systems developed by Microsoft for use on general-purpose computer systems, including home and business desktops, notebook computers, and media centers. ...


Mac OS also has SpeedStep built into the kernel, since the release of the Intel version of OS X 10.4. This article or section does not adequately cite its references or sources. ...


Versions

V1.1 is used by second generation Pentium III processors. It enables the CPU to switch between two modes: high and low frequency. This is done by modifying the CPU's multiplier. A 1 GHz Pentium III consuming about 20 watts could be reduced to 600 MHz which reduces the power consumption to about 6 watts.


V2.1 (Enhanced SpeedStep) is used in Pentium III-Mobile processors and is similar to the previous version, but in the low frequency mode the CPU also uses a different voltage than the high frequency mode.


V2.2 is adapted for Pentium 4-Mobile processors. With this a 1.8 GHz Pentium 4-M consuming about 30 watts can lower its frequency to 1.2 GHz, thus reducing power consumption to about 20 watts.


V3.1 (EIST) is used with the second generation of Pentium Mobile processors (Banias core, used in Centrino platforms). With this technology the CPU varies its frequency (and voltage) between about 40% and 100% of its base frequency in increments of 100 MHz. With this technology Intel also introduces realtime Level 2 cache capacity variation, further improving power savings.


V3.2 (Enhanced EIST) is adapted for dual-core processors with unified Level 2 cache.


See also

Advanced Micro Devices, Inc. ... CoolnQuiet is a CPU speed throttling and power saving technology introduced by AMD with their Athlon 64 processor line. ... PowerNow! is a feature of AMDs K6-2+, K6-III+, mobile Athlon, and Turion 64 processors used in laptops. ... Power management is a feature of some electrical appliances, especially copiers and computer peripherals such as monitors and printers, that turns off the power or switches the system to a low-power state after a period of inactivity. ...

External links

Notes

  1. ^ Processors - Update the Driver for Intel(R) SpeedStep(TM) Technology. Intel (2007-01-17). Retrieved on 2007-04-30.
  2. ^ Mobile Intel Pentium 4 Processors - M - Enhanced Intel SpeedStep(R) Technology. Intel (2006-07-06). Retrieved on 2007-04-30.
  3. ^ AMD Turion 64 X2 Dual-Core Mobile Technology Utilities & Updates. Advanced Micro Devices. Retrieved on 2007-04-30.
  4. ^ AMD Turion 64 Mobile Technology Utilities & Updates. Advanced Micro Devices. Retrieved on 2007-04-30.


Intel Corporation (NASDAQ: INTC, SEHK: 4335), founded in 1968 as Integrated Electronics Corporation, is an American multinational corporation that is best known for designing and manufacturing microprocessors and specialized integrated circuits. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era. ... is the 17th day of the year in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era. ... is the 120th day of the year (121st in leap years) in the Gregorian calendar. ... Intel Corporation (NASDAQ: INTC, SEHK: 4335), founded in 1968 as Integrated Electronics Corporation, is an American multinational corporation that is best known for designing and manufacturing microprocessors and specialized integrated circuits. ... Year 2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... is the 187th day of the year (188th in leap years) in the Gregorian calendar. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era. ... is the 120th day of the year (121st in leap years) in the Gregorian calendar. ... AMD headquarters in Sunnyvale Advanced Micro Devices, Inc. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era. ... is the 120th day of the year (121st in leap years) in the Gregorian calendar. ... AMD headquarters in Sunnyvale Advanced Micro Devices, Inc. ... Year 2007 (MMVII) is the current year, a common year starting on Monday of the Gregorian calendar and the AD/CE era. ... is the 120th day of the year (121st in leap years) in the Gregorian calendar. ...

List of CPU power saving technologies

CPU power saving technologies // Intel SpeedStep AMD CoolnQuiet Transmeta LongRun Transmeta LongRun2 VIA LongHaul Category: ...



Intel SpeedStep | AMD Cool'n'Quiet | AMD PowerNow! | Transmeta LongRun | Transmeta LongRun2 | VIA LongHaul CoolnQuiet is a CPU speed throttling and power saving technology introduced by AMD with their Athlon 64 processor line. ... PowerNow! is a feature of AMDs K6-2+, K6-III+, mobile Athlon, and Turion 64 processors used in laptops. ... LongRun is a power saving technology in the Transmeta Efficeon processor. ... LongRun2 is a power saving technology in the Transmeta Efficeon processor. ... Cargo 360 (IATA: GG, ICAO: GGC, and Callsign: Longhaul)[] is a cargo airline based in Seattle, Washington. ...


  (italics indicate technologies for non-x86 processors) x86 or 80x86 is the generic name of a microprocessor architecture first developed and manufactured by Intel. ...


 
 

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