Face side drunk

FSB (called also drunk intern, in drunk English internal or face-side drunk) is the bus system making it possible the processor to communicate with the main memory of the system (random access memory or RAM). Its flow depends on the speed of clock, expressed in MHz.

It is the Northbridge (Northern Bridge or Northern Bridge, also called controller report) which is charged to control the exchanges between the processor and the random access memory, this is why it is located geographically near to the Processeur. It is sometimes called GMCH, for Graphic and Memory Controller Hub.

The FSB (or an unspecified bus e.g.: USB) is characterized by the volume of information transmitted simultaneously. This volume, expressed in Bit S, corresponds to the number of physical lines on which the data are sent in a simultaneous way. A tablecloth of 32 wire thus makes it possible to transmit 32 [[bit]] S in parallel. One speaks thus about “width” to indicate the number of bits which a bus can transmit simultaneously.

In addition, the speed of the bus is also defined by its Fréquence (expressed in Hertz), i.e. the number of packages of data sent or receipts a second. One speaks about cycle to indicate each sending or reception of data.

In this way, it is possible to know the maximum flow of the bus (or rate of maximum transfer), i.e. the quantity of data which it can transport per unit of time, by multiplying its width by its frequency. A bus of a width of 16 bits, given rhythm at a frequency of 133 MHz thus has a flow equal to:

16 × 133 bit/s =: 2128 bit/s = 266 o/s = 266 Mo/s

Currently, the computers use a FSB of the type Hyper Transport, whose license is free. Version 3.0 of Hyper Transport is most recent and hardly arrives in our computers. The FSB is the major element of a computer, as well as the processor, it establishes the link between the different components (memory, graphics card, port of extension of the type NCV etc). The frequency of the Processeur rises from the FSB, because it is equal to the FSB multiplied by a coefficient specific to the processor. The same applies to the RAM ( random access memory ), whose frequency is that of the FSB multiplies by a whole or fractional figure. Example: if the FSB is to 200 MHz, and that the RAM is to 400 MHz, the frequency of the FSB was multiplied by two. If the RAM is to 100 MHz, the FSB was multiplied by ½.

But rather than to give these values, one generally speaks about ration RAM/FSB, i.e. the frequency of the RAM divided by that of the FSB.

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