In April 2003, AMD released the first x86 processor with 64-bit physical memory address registers capable of addressing much more than 4 GB of memory using the new x86-64 extension (also known as x64). Intel introduced its first x86-64 processor on July 2004.
x86-64 had been preceded by another architecture employing 64-bit memory addressing: Intel introduced Itanium in 2001 for the high-performance computing market. However, Itanium was incompatible with x86 and is less widely used today. x86-64 also introduced the NX bit, which offers some protection against security bugs caused by buffer overruns.
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Mon Jul 11, 2011 7:36 am by chandra132
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