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Encyclopedia > CPU core voltage
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The CPU core voltage (VCore) is the power supply voltage supplied to the CPU (which is a digital circuit). The amount of power a CPU uses, and thus the amount of heat it dissipates, is the product of this voltage and the current it draws. In modern CPUs, which are made using CMOS, the current is almost proportional to the clock speed, the CPU drawing almost no current between clock ticks. (See, however, subthreshold leakage.) Jump to: navigation, search A power supply unit (sometimes abbreviated power supply or PSU) is a device or system that supplies electrical or other types of energy to an output load or group of loads. ... This article may be too technical for most readers to understand. ... Jump to: navigation, search This article needs to be cleaned up to conform to a higher standard of quality. ... Digital circuits are electric circuits based on a number of discrete voltage levels. ... // Mechanical power In physics, power (symbol: P) is the amount of work W done per unit of time t. ... Jump to: navigation, search In electricity, current refers to electric current, which is the flow of electrons. ... Jump to: navigation, search Static CMOS Inverter CMOS (pronounced see-moss), which stands for complementary metal-oxide-semiconductor, is a major class of integrated circuits. ... The clock rate is the fundamental rate in cycles per second, measured in hertz, at which a computer performs its most basic operations such as adding two numbers or transferring a value from one processor register to another. ... Subthreshold leakage of an NMOS Subthreshold leakage is the current that flows from the drain to source of a MOSFET when the transistor is supposed to be off. ...


In order to help conserve power and manage heat, many laptop and desktop processors have a power management feature that allows software (usually the operating system) to adjust the clock speed dynamically. Jump to: navigation, search Laptop with touchpad. ... Desktop computer with several common peripherals (Monitor, keyboard, mouse, speakers, microphone and a printer) A desktop computer is an independent personal computer that is made especially for use on a desk in an office or home. ... Power management is a feature of some electrical appliances, especially copiers and computer peripherials, such as a monitor or printer that turns off the power or switches the system to a low-power state after a period of inactivity. ... Jump to: navigation, search In computing, an operating system (OS) is the system software responsible for the direct control and management of hardware and basic system operations. ...


The trend is towards lower core voltages, which conserve power. This presents the CMOS designer with a challenge. Since, in CMOS the voltages go only to ground and the supply voltage, the various electrodes of the FETs, that is, source, drain, gate, have only the supply voltage or zero across them. The MOSFET formula:
says that the current ID supplied by the FET is proportional to the gate-source voltage reduced by a threshold voltage Vtn which is dependent on the geometrical shape of the FET's channel and gate and their physical properties, especially capacitance. In order to reduce Vtn (necessary both in order to reduce the supply voltage and to increase current) one must increase capacitance. But, the load being driven is in fact another FET gate. The current needed to drive it is proportional to capacitance, which thus requires the designer to keep it low. The trend towards lower supply voltage therefore works against the goal of high clock speed. Only improvements in photolithography allow both to improve at once. The field-effect transistor (FET) is a transistor that relies on an electric field to control the shape and hence the conductivity of a channel in a semiconductor material. ... Jump to: navigation, search The MOSFET, or Metal-Oxide-Semiconductor Field-Effect Transistor, is by far the most common field effect transistor in both digital and analog circuits (The Metal in the name is an anachronism from early chips where gates were metal; modern chips use polysilicon gates, but are... Depletion Region of an NMOS The threshold voltage of a MOSFET is usually defined as the gate voltage where a depletion region forms in the substrate (body) of the transistor. ... Capacitance is a measure of the amount of electric charge stored (or separated) for a given electric potential. ... Photolithography is a process used in semiconductor device fabrication to transfer a pattern from a photomask (also called reticle) to the surface of a substrate. ...


When a processor is overclocked, increasing the core voltage often increases stability (as well as power consumption and heat dissipation). This is known as overvolting. Overvolting generally involves running a processor out of its specifications, which may damage it or shorten its life. A notable overclock with extreme overvolting is the 5GHz project on Tom's Hard Ware guide, [1] This article needs to be cleaned up to conform to a higher standard of quality. ...


  Results from FactBites:
 
CPU core voltage - Wikipedia, the free encyclopedia (428 words)
The CPU core voltage (VCore) is the power supply voltage supplied to the CPU (which is a digital circuit).
In modern CPUs, which are made using CMOS, the current is almost proportional to the clock speed, the CPU drawing almost no current between clock ticks.
When a processor is overclocked, increasing the core voltage often increases stability (as well as power consumption and heat dissipation).
Tuning Extreme: Overclocking with the Asus A7V - THG.RU (1272 words)
The core voltage is the limiting factor for overclocking AMD's Duron and Athlon processors.
Installing the resistor changes the core voltage, which means the preset values in the Asus A7V BIOS do not match the actual voltages.
Since the preset CPU voltage does not match the actual voltage after the resistor has been soldered in, a precise control is very important.
  More results at FactBites »

 
 

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