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    The address bus is the set of wire traces that is used to identify which address in memory the CPU is accessing.

    The number of wire traces in the address bus limits the maximum amount of RAM which the CPU can address.

    CPU Address Bus Sizes

    CPU Address Bus Size
    8086 20 bit
    8088 20 bit
    80286 24 bit
    80386SX 24 bit
    80386DX 32 bit
    80486SX 32 bit
    80486DX 32 bit
    Pentium I 32 bit
    K6 32 bit
    Duron 32 bit
    Athlon 32 bit
    Athlon XP 32 bit
    Celeron 36 bit
    Pentium Pro 36 bit
    Pentium II 36 bit
    Pentium III 36 bit
    Pentium 4 36 bit
    Athlon 40 bit
    Athlon-64 40 bit
    Athlon-64 FX 40 bit
    Opteron 40 bit
    Itanium 44 bit
    Itanium 2 44 bit

    Address Bus Memory Capacity Chart

    Address Bus Size Maximum RAM
    20 bits 1MB
    24 bits 16MB
    32 bits 4GB
    36 bits 64GB
    40 bits 1TB
    44 bits 16TB

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