Microsoft has also customized Windows XP to suit different markets. Five different versions of XP for specific hardware were designed, two of them specifically for 64-bit processors.
Windows XP 64-bit Edition
This edition was designed specifically for Itanium-based workstations. This edition was discontinued in early 2005, after HP, the last distributor of Itanium-based workstations, stopped selling Itanium systems marketed as 'workstations'. However, Itanium support continues in the server editions of Windows.
Windows XP Professional x64 Edition
Not to be confused with the previous 64-bit Itanium edition of Windows XP, this edition is based on Windows Server 2003 and supports x86-64 extension of the Intel IA-32 architecture. x86-64 is implemented by AMD as "AMD64", found in AMD's Opteron and Athlon 64 chips, and implemented by Intel as "Intel64" (formerly known as IA-32e and EM64T), found in Intel's Pentium 4 and later chips.
Microsoft had previously supported other microprocessors with earlier versions of the Windows NT operating system line (including two 64-bit lines, the DEC Alpha and the MIPS R4000, although Windows NT used them as 32-bit processors). The files necessary for all of the architectures were included on the same installation CD and did not require the purchase of separate versions.
Windows XP 64-bit Edition
This edition was designed specifically for Itanium-based workstations. This edition was discontinued in early 2005, after HP, the last distributor of Itanium-based workstations, stopped selling Itanium systems marketed as 'workstations'. However, Itanium support continues in the server editions of Windows.
Windows XP Professional x64 Edition
Not to be confused with the previous 64-bit Itanium edition of Windows XP, this edition is based on Windows Server 2003 and supports x86-64 extension of the Intel IA-32 architecture. x86-64 is implemented by AMD as "AMD64", found in AMD's Opteron and Athlon 64 chips, and implemented by Intel as "Intel64" (formerly known as IA-32e and EM64T), found in Intel's Pentium 4 and later chips.
Microsoft had previously supported other microprocessors with earlier versions of the Windows NT operating system line (including two 64-bit lines, the DEC Alpha and the MIPS R4000, although Windows NT used them as 32-bit processors). The files necessary for all of the architectures were included on the same installation CD and did not require the purchase of separate versions.
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