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Topic: CPU power consumption


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AMD

In the News (Wed 22 May 19)

  
  CPU-World: From Intel 4004 processor to AMD Athlon 64 X2 and Intel Core 2 Duo CPUs
The Geode CPUs have very low power consumption, especially NX 1250 and NX 1500 models - their maximum Thermal Design Power is 9 Watt, and typical TDP is 6 Watt.
For example, NX 1500 CPU is rated higher than Athlon XP-M 1400+ AXML1400GYS3C, while the internal frequency of NX 1500 is 200 MHz lower than the one of Athlon XP-M 1400+.
Voltage regulator is used to convert 12 Volt module voltage to voltage required for the CPU (usually 1.6V) and nortbridge chip.
www.cpu-world.com   (1851 words)

  
  Kids.Net.Au - Encyclopedia > CPU power consumption
This must be considered when choosing a power supply unit, and when power consumption is constrained by production and cost.
CPUs in personal computers use a lot of power because the manufacturers are rewarded for raw speed instead of energy efficiency.
Processor manufacturers usually release two power consumption numbers for a CPU, first is the 'typical' thermal power, which is how much power the CPU draws under normal load, and the other is the maximum thermal power, which is how much power it can draw if you give it a worst-case set of instructions.
www.kids.net.au /encyclopedia-wiki/cp/CPU_power_consumption   (479 words)

  
 Danger, High Voltage: CPU Power Consumption and Cooling
CPUs' core voltages, heat and power dissipation, and temperature ratings are increasingly important aspects of PC architecture.
This figure, different for different manufacturers' CPU families, is expressed in volts, such as a core voltage of 1.5V for Intel's 2.4GHz Pentium 4.
The most common voltage shift is an upward one, as a CPU model climbs up the gigahertz ladder: When the Pentium 4 reached 2.6GHz last year, Intel nudged up the core voltage rating for that and faster models to 1.525V.
www.cpuplanet.com /features/article.php/1690721   (1017 words)

  
 Dr. Dobb's | Programming High-Performance DSPs: Part 3 | November 30, 2006
Given the proliferation of portable embedded devices, power consumption has become almost as important as execution time and memory use, and in some cases, the most important parameter to optimize in an embedded system.
In processor design, power consumption is proportional to the square of the supply voltage, so the lower the supply voltage the better from a power perspective.
Another form of power consumption, leakage, deals with basic circuit characteristics, and can be eliminated by disconnecting power [2].
www.ddj.com /dept/security/196600652?pgno=2   (710 words)

  
  Power Management in Linux-Based Systems   (Site not responding. Last check: 2007-10-26)
Power management (PM) software is a crucial component in battery-powered systems, such as PDAs and laptops, because it helps conserve power when the system is inactive.
Power consumption is maximum in this state, as all devices are turned on or active.
Power is conserved aggressively by putting the CPU in sleep mode, which in turn powers off most devices.
www.linuxjournal.com /node/6699/print   (2967 words)

  
 Found definitive amd power specs - 2460 upgraders - 2CPU.com Discussion Forums
For the curious, the formula for the power consumption of a CPU is P=K*F*V^2, where P is power, F is frequency (in Hertz), V is the CPU's core voltage, and K is the empirical constant that's specific to each CPU core (e.g., Thunderbird, Palomino, etc).
Because only the power consumption (or, alternatively, the product of vcore and icore) of a CPU determine the share of the load it places on the power supply (see http://forums.2cpu.com/showthread.ph...557#post223050), any CPU that uses more than about 68W of power should be considered unsafe to operate on the S2460 in dual processor configuration.
The large discrepancy in power consumption is due to the lower vcore (1.60v versus 1.65v on the 2400+).
forums.2cpu.com /showthread.php?postid=225029   (1314 words)

  
 CPU power dissipation - Wikipedia, the free encyclopedia
This power is dissipated both by the action of the switching devices contained in the CPU (such as transistors or vacuum tubes) as well as energy lost in the form of heat due to the resistivity of the electrical circuits.
The steady trend in CPU power supplies over the past decade has been towards using lower voltages and having considerably higher currents.
Processor manufacturers usually release two power consumption numbers for a CPU, the typical thermal power, which is measured under normal load, and the maximum thermal power, which is measured under a worst-case set of instructions.
en.wikipedia.org /wiki/CPU_power_consumption   (862 words)

  
 PDA Encyclopedia - CPU
The central processing unit (CPU) is the part of a computer that interprets and carries out the instructions contained in the software.
In most CPUs, this task is divided between a control unit that directs program flow and one or more execution units that perform operations on data.
The term CPU is often used vaguely to include other centrally important parts of a computer such as caches and input/output controllers, especially in computers with modern microprocessor chips that include several of these functions in one physical integrated circuit.
www.pdasupport.com /PDAencyclopediaCPU.htm   (221 words)

  
 saving power in portable computers: speculations
Power consumption at a fixed voltage (on CMOS CPUs) is close to directly proportional to the clock speed; power consumption at a fixed clock speed is proportional to the square of the voltage.
I seem to recall that Transmeta's CPUs aren't making as much of a difference in power consumption as some had hoped, so they aren't being widely deployed, which is a shame.
On a CPU where core voltage is adjusted in concert with clock speed, running some of it at one speed and the rest of it at another speed will cost more energy than running it all at the average of those speeds, but take the same time.
lists.canonical.org /pipermail/kragen-tol/2002-May/000708.html   (1137 words)

  
 silentpcreview.com | View topic - Desktop CPU Power Survey, April 2006
The power efficiency diferences between the different integrated chipsets would also be nice to know, but this review could have at least shown the difference single and dual channel DDR make using the same chipset.
These are the voltages that affect the idle power consumption, and the greatest power savings would be relealized by finding the lowest voltages for that state.
On the system power side, my guess is that the drop in power would be highest with the high power processors and virtually nil for the lowest -- the latter because VRM and PSU efficiency and residual power demand from other components would compress any power reductions.
www.silentpcreview.com /forums/viewtopic.php?t=30546   (4463 words)

  
 TCI Powermanagement
Much of the increase in electricity consumption at Tufts over the last few years can be attributed to the large increase in technology usage (see inventory).
Power management is a process that allows monitors and computers to enter low-power states when sitting idle.
Some monitors, even after power management enablement, may not enter sleep mode because they may be incapable of power management, or a screen saver may be interfering with power management operation.
www.tufts.edu /tie/tci/pcpowermanagement/FAQ.html   (1447 words)

  
 Linux Cyrix/IBM 6x86 mini-HOWTO: Cooling
However, a clever feature of the Cyrix CPUs is to enter a special power-down mode when executing a halt instruction, that will cut its rated power dissipation from 20 W or so down to around 250 mW (or even less than 150 mW on the newer 6x86MX chips).
Another issue that may plague users of the most recent 6x86MX (and AMD K6) CPUs on older motherboard designs is that the linear voltage regulator circuitry will simply not handle the transient current peaks generated by the newer processors, no matter how well cooled it may be.
However, this has nothing to do with CPU quality, it is rather a problem of long-term reliability and quality built in the motherboards.
gwyn.tux.org /~balsa/linux/cyrix/p6.html   (1081 words)

  
 Maximizing Power Savings on Mobile Platforms
Power measurements were done with Fluke NetDAQ, which reports average power (in watts [W]) which is then converted to total power using application run-time data (mWHr).
The power data is measured for 50 seconds in both ST and MT cases.
As shown in Figure 7, CPU power consumption data—the second scenario that is affinitizing both applications to individual cores—demonstrates slightly higher power consumption as compared to Windows XP scheduling.
www.intel.com /technology/magazine/computing/mobile-power-saving-0506.htm   (3040 words)

  
 FAQs
In the 286/386 CPU era, the number of transistors inside the CPU was not big due to the limited number of bytes and low frequency (from 6mhz to 12Mhz only).
By means of the free convection between CPU itself and air, the operating temperature could be successfully lowered.
The thermal problem then could not be effectively solved without forced convection which is created by CPU cooler, note examples Pentium 233 MHz (power consumption: 18Mhz) and AMD K6 233MHz (28.3 Watts).
www.globalwinusa.com /faqs/cpu/why.html   (147 words)

  
 EETimes.com - Software Matters for Power Consumption
This advance in power management is based on the following observation: the energy consumed by a processor is directly proportional to the clock frequency driving it and to the square of the voltage applied to its core.
Minimizing sleep mode power consumption can be the difference between a device that has to have its batteries recharged every day and one that can go weeks between recharges.
Minimizing sleep mode power consumption requires analyzing the hardware in your system and determining how to set it into the lowest-possible power state.
www.eetimes.com /story/OEG20030121S0057   (2543 words)

  
 LostCircuits, CPU Guide
Originally we were a bit stunned by the fact that the E6300 does not show any power reduction compared to its faster brethrens, however, after factoring in all parameters as explained two pages ago, the results appear to be right on target as well.
That does not mean that under catastrophic conditions, even higher power consumption levels might be achievable but overall, the numbers shown are pretty much the highest power consumption that can be accomplished in any standard environment.
The power measurements shown are independent of any real computing benchmark results, however, actual efficiency needs to take performance into account as well in order to generate any relevance in form of an instructions per Watt metric.
www.lostcircuits.com /cpu/low_e/5.shtml   (547 words)

  
 Embedded.com - Tutorial: Programming High-Performance DSPs, Part 3
Given the proliferation of portable embedded devices, power consumption has become almost as important as execution time and memory use, and in some cases, the most important parameter to optimize in an embedded system.
In processor design, power consumption is proportional to the square of the supply voltage, so the lower the supply voltage the better from a power perspective.
Another form of power consumption, leakage, deals with basic circuit characteristics, and can be eliminated by disconnecting power [2].
www.embedded.com /showArticle.jhtml?articleID=196600630&pgno=2   (829 words)

  
 OnTarget CPU Cool (aka Waterfall Pro)
CPU Cool is a very powerful utility which protects your PC and cools down your processor.
When an overclock is not stable, sometimes when the CPU is not 100% in use it may give you the wrong feeling that it's stable, but when you use a CPU intensive application or game, it may crash (not because of Rain or CPU Cool, but because it's not stable).
CPU Cool 2.0 is more stable than other cooling programs and it will try to close other cooling programs to protect your system.
www.softwarecove.com /cpucool   (1696 words)

  
 AMD K8
Mobile Athlon 64 CPU family was replaced by Turion 64 Mobile technology family.
Power consumption of Turion 64 is usually lower or much lower than power consumption of mobile Athlon 64 CPUs.
Core voltage of the Turion 64 X2 CPUs is lower that the one of Turion 64 processors, which helps to reduce power consumption further.
www.cpu-world.com /CPUs/K8   (868 words)

  
 Processor Electrical Specifications
Thermal Design Power (TDP) is measured under the conditions of TcaseMax, IDDMax, and VDD=VID_VDD, and include all power dissipated on-die from VDD, VDDIO, VLDT, VTT, and VDDA.
The Estimated Max Power Dissipation numbers are based on the fact that Intel estimates the power dissipation for various software applications and sets the Thermal Design Point as the upper limit for how far these applications might push the Pentium 4.
Intel states: "Processor power dissipation simulations indicate a maximum application power in the range of 75% of the maximum power for a given frequency." So the Est Max Power Diss was calculated by dividing the TDP by 75%.
users.erols.com /chare/elec.htm   (1472 words)

  
 Embedded.com - Software Matters for Power Consumption
This advance in power management is based on the following observation: the energy consumed by a processor is directly proportional to the clock frequency driving it and to the square of the voltage applied to its core.
Minimizing sleep mode power consumption can be the difference between a device that has to have its batteries recharged every day and one that can go weeks between recharges.
Minimizing sleep mode power consumption requires analyzing the hardware in your system and determining how to set it into the lowest-possible power state.
www.embedded.com /story/OEG20030121S0057   (2493 words)

  
 What is the power consumption of this CPU? - PC Perspective Forums
You can't compare power consumption of a laptop (optimized for low power) with the power comsumption of a desktop system.
The CPU itself can consume in the 90W range all by itself (don't assume the lower average wattages based on power saving figures).
That CPU will work in your machine, so will this 3.06 Ghz CPU, which has HyperThreading (the only one that your chipset will support).
forums.pcper.com /showthread.php?t=370159   (1584 words)

  
 Power consumption compared
So, I just made a bold assumption that perhaps all the different K8 chips based on the same core consume roughly equal amounts of power assuming the fequency and I adjusted the Sempron 3100+ voltage to be equal to the ones used on actual A64 chips to extrapolate the consumption on those.
The problem seems to have been that most mobos were designed so that their CPU power regulator was fed from +5V PSU and most PSU-s and mobos couldn’t take the wild power consumption changes happening on this +5V rail (check out the max power consumption of a Palomino and see the huge difference).
I have not measured this, it is mighty difficult to measure it without doing some serious excercises on a mobo using a soldering iron, because this power is drawn from a +3.3V rail among with all the other chips present on the motherboard.
www.goodwin.ee /sulo/Power2.htm   (2010 words)

  
 Linux Cyrix/IBM 6x86 mini-HOWTO: Cooling
However, a clever feature of the Cyrix CPUs is to enter a special power-down mode when executing a halt instruction, that will cut its rated power dissipation from 20 W or so down to around 250 mW (or even less than 150 mW on the newer 6x86MX chips).
Another issue that may plague users of the most recent 6x86MX (and AMD K6) CPUs on older motherboard designs is that the linear voltage regulator circuitry will simply not handle the transient current peaks generated by the newer processors, no matter how well cooled it may be.
However, this has nothing to do with CPU quality, it is rather a problem of long-term reliability and quality built in the motherboards.
www.tux.org /~balsa/linux/cyrix/p6.html   (1081 words)

  
 AMD: Intel's Conroe power advantage claim based on skewed metric | TG Daily   (Site not responding. Last check: 2007-10-26)
One of AMD's key bullet points is that the numbers Intel boasts for power consumption, and those AMD boasts, aren't determined on a level playing field.
In the definition of the term set forth by Tom's Hardware Guide years ago, TDP is "the maximum amount of power the thermal solution is required to dissipate." In other words, TDP is a benchmark figure relative to how a cooling device, such as a heat sink or a fan, dissipates heat.
Its original intent was to show the maximal power consumption that a physical system could withstand and still dissipate heat at necessary levels.
www.tgdaily.com /2006/07/14/amd_says_intel_conroe_power_claims_skewed   (1046 words)

  
 CPU Shack - IBM PowerPC 603e 240Mhz
Power Computing Corporation also announced its PowerBase line with the same microprocessor.
The high performance and low power consumption of all PowerPC 603e microprocessors enable manufacturers to build systems ranging from subnotebooks to high-performance notebooks and desktops.
In fact, the maximum power consumption of the 240 MHz PowerPC 603e (5.5 watts) is less than the typical power consumption of the 200 MHz Pentium (6.5 watts).
www.cpushack.net /CIC/announce/1996/IBMPowerPC603e-240MHz.html   (543 words)

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