32-bit editions of Windows XP are limited to a total of 4 gigabytes. The primary benefit of moving to 64-bit is the increase in the maximum allocatable random-access memory (RAM).
It is designed to use the expanded 64-bit memory address space provided by the x86-64 architecture. Microsoft Windows XP Professional 圆4 Edition, released on April 25, 2005, is an edition of Windows XP for x86-64 personal computers.
