Most current desktop and mobile computers use 32-bit processors made by Intel or AMD. But that position won't last long because the latest processors made by both companies are 64-bit processors that can run both 32-bit and 64-bit software.
The single-core Athlon 64 and dual-core Athlon 64 X2 64-bit processors from AMD (that, in theory, can access and transport twice as much data at once as 32-bit processors) are available. The new processors have more pins than their predecessors, the Athlon XP Socket A processors, which are now out of production.
The Athlon 64 processors can run 64-bit applications, which are not yet available, and the current 32-bit software. A 64-bit version of Windows XP Professional Edition for 64-bit processors is now available, but there is currently (August 2005) no 64-bit version of Windows XP Home Edition.
No emulation mode is used by a 64-bit processor in order for it to run 32-bit software. The processor can run both types naturally and at once.
Click here! to go to information on the Software pages of this site on the 64-bit versions of Windows XP and Windows Vista.
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