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Monday, April 05, 2010

PCI and PCI Express


PCI (Peripheral Component Interconnect)

Is a computer bus for attaching hardware devices in a computer. These devices device
need the PCI specification, or an expansion card that fits into the PCI slot. Despite the availability of
 faster interfaces such as
 PCI Express, conventional PCI remains the most
common interface The PCI specification covers the physical size of the bus (including
wire spacing), electrical characteristics, bus timing, and protocols.
Typical PCI cards
used in PCs include: network cards" sound cards. modems, extra ports such as USB or
serial, TV tuner cards. Historically video cards were typically PCI devices, but growing
bandwidth requirements soon outgrew the capabilities of PCI. PCI video cards remain
available for supporting extra monitors and upgrading PCs that do not have any AGP or
PCI Express slots.
Many devices traditionally provided on expansion cards are now commonly integrated
onto the motherboard itself, meaning that modern PCs often have no cards fitted.
However, PCI is still used for certain specialized cards, although many tasks traditionally
performed by expansion cards may now be performed equally well by USB devices.


 A. PCI Slot
B.  PCI-E 16 x Slot
C.  PCI-E 1x Slot

PCI Express (Peripheral Component Interconnect Express)

Is a computer expansion card standard designed to replace the older PCI, and AGP
standards. The PCIe bus can be thought of as a high-speed serial replacement of the PCL
PCIe is the latest standard for expansion cards that is available on mainstream personal
computers.


Bits to Exibits




Standard                                          Abv                                    Amount

I bit'                                                 b                                         0 ro 1

I byte                                               B                                        8Bits

I kilobit                                            kb                                      1000 Bits

l Megabit                                         Mb                                      1000 Kilobits

I Gigabit                                          Gb                                        1000 Megabits

I Terabit                                           Tb                                        1000 Gigabits

I Petabit                                           Pb                                         1000 Terabits

1 Exabit                                           Eb                                          1000 Petabits


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