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The maximum amount of RAM that Windows XP can support varies depending on the product edition and the processor architecture. All 32-bit editions of XP support up to 4 GB, except the Windows XP Starter edition, which supports up to 512 MB of RAM. [103] The 64-bit editions support up to 128 GB. [104]
A single standard process on a 32-bit Windows operating system is limited to a total of 2,093,056 kilobytes (2 GB minus one 4 KB page), while large address aware [45] 32-bit processes can allocate up to 4 GB. Windows XP x64 can support much more memory; although the theoretical memory limit a 64-bit computer can address is about 16 exabytes ...
The original releases of Windows XP and Windows XP SP1 used PAE mode to allow RAM to extend beyond the 4 GB address limit. However, it led to compatibility problems with 3rd party drivers which led Microsoft to remove this capability in Windows XP Service Pack 2.
Many 32-bit computers have 32 physical address bits and are thus limited to 4 GiB (2 32 words) of memory. [3] [4] x86 processors prior to the Pentium Pro have 32 or fewer physical address bits; however, most x86 processors since the Pentium Pro, which was first sold in 1995, have the Physical Address Extension (PAE) mechanism, [5]: 445 which allows addressing up to 64 GiB (2 36 words) of memory.
Although the theoretical memory limit of a 64-bit computer is about 16 exabytes (17.1 billion gigabytes), Windows XP Professional x64 Edition is limited to 128 GB of physical memory and 16 terabytes of virtual memory. [16] Windows XP Professional x64 Edition also offers a number of benefits/advantages over the main 32-bit x86 versions of ...
The Free Edition (limited to Windows 32-bit Win2000 / XP / 2003) is able to use 'invisible' RAM in the 3.25 to 4 GB 'gap' (if your motherboard has i946 or above chipset) & is also capable of 'saving to hard disk on power down' (so, in theory, allows you to use the RAM disk for Windows XP swap file and survive over a 'Hibernate').