3 types of PCI buses

The PCI bus architecture is a processor-independent bus specification that allows peripherals to access system memory directly without using the CPU. Not only does this free up the CPU to service other application calls, but PCI users also can simultaneously acquire data to memory and analyze existing data in real time, all while communicating with other functions on the network.

More importantly, PCI peripherals running asynchronously can send data along the 32-bit bus at a rate of up to 132 MB/s or 66 MS/s.

PCI-X stands for "PCI-eXtended". PCI-X is a computer bus and expansion card standard that enhances the 32-bit PCI Local Bus for higher bandwidth demanded by servers. It is a double-wide version of PCI, running at up to four times the clock speed, but is otherwise similar in electrical implementation and uses the same protocol.[1] It has itself been replaced in modern designs by the similar-sounding PCI Express, which features a very different logical design, most notably being a "narrow but fast" serial connection instead of a "wide but slow" parallel connection.

PCI-X revised the conventional PCI standard by doubling the maximum clock speed (from 66 MHz to 133 MHz)[1] and hence the amount of data exchanged between the computer processor and peripherals. Conventional PCI supports up to 64 bits at 66 MHz (though anything above 32 bits at 33 MHz is only seen in high-end systems) and additional bus standards move 32 bits at 66 MHz or 64 bits at 33 MHz. The theoretical maximum amount of data exchanged between the processor and peripherals with PCI-X is 1.06 GB/s, compared to 133 MB/s with standard PCI. PCI-X also improves the fault tolerance of PCI allowing, for example, faulty cards to be reinitialized or taken offline.

PCIe, or Peripheral Component Interconnect Express, is a computer expansion card standard designed to replace the older PCI, PCI-X, and AGP standards. PCI Express is used in consumer, server, and industrial applications, as a motherboard-level interconnect (to link motherboard-mounted peripherals) and as an expansion card interface for add-in boards. A key difference between PCIe and earlier buses is a topology based on point-to-point serial links, rather than a shared parallel bus architecture.

3 types of PCI buses

AGP buses

3.3 V

1.5 V

Universal

1.5 V AGP Pro

Universal AGP Pro

Buses and expansion slots

A Bus is a computer architecture which is a communication system that transfers data between components inside the computer or between computers.

PCI Riser Card

what is the speed and memory for front side bus

The older versions of computer buses were usually 32 bit and newer ones are now around 64 bits with 96 bit data paths

Its related directly to the speed grade of memory a system

the memory bus connects the north bridge and ram just as the front connects the CPU and north bridge

Used to allow adding expansion cards to a system enclosed in a low profile case.

Riser card is a board that plugs in the system board and provides additional slots for adapter cards

Buy these when you need an expansion

PCI Express

PCIX

PCIE

Conventional PCI

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