2.3 64 bit x86-64 Processors

  • Important Features
    • Backwards compatible with x86 instruction set
    • Allows addressing 2^64 bytes (currently only 48 bits are used)
    • Uses 64 bit general purpose registers
    • Eight more general purpose registers over 32 bit
    • 48 bit physical address space which supports up to 256 terabytes of RAM
    • 16 bit real mode and virtual 8086 mode have been removed

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