To be notified of new Q you may right-click My Computer and click Properties. The window that pops up will tell you which version of XP you're running. XP Home The Home edition of Windows XP-the edition that came with most machines home users bought from the likes of Dell and HP, before Windows Vista-supports only one processor. This means if you want to install more than one processor and you run Windows XP Home, you may need to switch to Professional, or upgrade Windows to a newer version with support for multiple processors. XP Professional If you want to use two processors, Windows XP Professional is the way to go. While this advanced program cannot run more than two processors, this is an improvement over Home. Note that, because dual-core processors count as a single processor, you could theoretically have four cores with this license or even eight, if you are willing to buy two quad-core processors. I suggest you to visit this below provided Microsoft KB article. Processor and memory.
For the 64-bit Windows XP for Itanium systems, see Windows XP 64-bit Edition. Microsoft Windows XP Professional x64 Edition released on April 25, 2005 is an edition of Windows XP for x86-64 personal computers. It is designed to use the expanded 64-bit memory address space provided by the x86-64 architecture.[1] The primary benefit of moving to 64-bit is the increase in the maximum allocatable random access memory ( RAM). Windows XP 32-bit is limited to a total of 4 gigabytes. Although the theoretical memory limit of a 64-bit computer is about 18 exabytes (18 billion gigabytes Windows XP x64 is limited to 128 GB of physical memory and 16 terabytes[citation needed] of virtual memory. Windows XP Professional x64 Edition uses the same kernel and code tree as Windows Server 2003[3] and is serviced by the same service pack.[4] However, it includes client features of Windows XP such as System Restore, Windows Messenger, Fast User Switching, Welcome Screen, Security Center and games, which Windows Server 2003 does not have. Windows XP Professional x64 Edition is not to be confused with Windows XP 64-bit Edition, as the latter was designed for Itanium architecture.[5][6] During the initial development phases, Windows XP Professional x64 Edition was named Windows XP 64- Bit Edition for 64- Bit Extended Systems.[7] Contents 1 Advantages 2 Software compatibility 3 Known limitations 4 Service Packs 5 References 6 Further reading 7 External links Advantages[edit] Supports up to 128 GB of RAM.[8] Supports up to two physical CPUs (in separate physical sockets) and up to 64 logical processors (i.e. cores or threads on a single CPU). As such, As of 2014[update], the OS supports all commercially available multicore CPUs, including Intel Core series, or AMD FX series. Uses the Windows Server 2003 kernel which is newer than 32-bit Windows XP and has improvements to enhance scalability.[9].
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