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    The Front Side Bus (FSB) is the connecting path between the CPU and other key components such as system memory.

    The Front Side Bus is also called the Data Bus and the Processor Side Bus (PSB).

    Front Side Bus Widths of Various CPUs

    CPU Front Side Bus Width
    8088 8
    8086 16
    80286 16
    80386SX 16
    80386DX 32
    80486 32
    AMD 5×86 32
    Pentium 64
    AMD K6 64
    Pentium Pro 64
    Celeron 64
    Pentium II 64
    Pentium III 64
    AMD Duron 64
    AMD Athlon 64
    AMD Athlon XP 64
    Pentium 4 64
    Itanium 64
    AMD Athlon 64 64

    Competing Front Side Bus Technologies

    The EV6 Front Side Bus

    Front Side Bus

    AMD uses the EV6 Front Side Bus in its Athlon and Athlon XP CPUs.

    Athlon and Athlon XP CPUs with the EV6 bus are able to transfer data over the Front Side Bus twice per processor cycle.

    The AGTL+ Front Side Bus

    Intel uses the AGTL+ Front Side Bus in its Pentium 4 processors.

    Pentium 4s with AGTL+ are able to transfer data over the Front Side Bus four times per processor cycle.

    However, the AGTL+ bus is shared among all of the systems CPUs. The EV6 bus is a point-to-point bus, meaning that the full bandwidth of the bus is available to every CPU.

    HyperTransport

    AMD Athlon64, AthlonFX, and Opteron CPUs utilize the HyperTransport Bus.

    These CPUs move the memory controller into the CPU, effectively eliminating the Front Side Bus.

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