At what point do we just call x86_64 "x86"? Do you for example have any x86 hardware that doesn't support x86_64? If so, what is it and what is it used for?
>> The first AMD64-based processor, the Opteron, was released in April 2003.
>> The first processor to implement Intel 64 was the multi-socket processor Xeon code-named Nocona in June 2004.
>> Intel's official launch of Intel 64 (under the name EM64T at that time) in mainstream desktop processors was the N0 Stepping Prescott-2M. All 9xx, 8xx, 6xx, 5x9, 5x6, 5x1, 3x6, and 3x1 series CPUs have Intel 64 enabled, as do the Core 2 CPUs, as will future Intel CPUs for workstations or servers. Intel 64 is also present in the last members of the Celeron D line.
>> The first Intel mobile processor implementing Intel 64 is the Merom version of the Core 2 processor, which was released on 27 July 2006.
from http://en.wikipedia.org/wiki/X86-64
>> The first AMD64-based processor, the Opteron, was released in April 2003.
>> The first processor to implement Intel 64 was the multi-socket processor Xeon code-named Nocona in June 2004.
>> Intel's official launch of Intel 64 (under the name EM64T at that time) in mainstream desktop processors was the N0 Stepping Prescott-2M. All 9xx, 8xx, 6xx, 5x9, 5x6, 5x1, 3x6, and 3x1 series CPUs have Intel 64 enabled, as do the Core 2 CPUs, as will future Intel CPUs for workstations or servers. Intel 64 is also present in the last members of the Celeron D line.
>> The first Intel mobile processor implementing Intel 64 is the Merom version of the Core 2 processor, which was released on 27 July 2006.