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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]
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.
32-bit versions of Microsoft Windows support PAE if booted with the appropriate option. According to Microsoft Technical Fellow Mark Russinovich, some drivers were found to be unstable when encountering physical addresses above 4GB. [16] The following table shows the memory limits for 32-bit versions of Microsoft Windows:
Limit on IA-32 Limit in IA-64 Limit on x64 Limit on ARM32 Limit on ARM64; Windows NT 3.1: 4 GB — — — — Windows NT 3.5: 4 GB — — — — Windows NT 3.51: 4 GB — — — — Windows NT 4.0: 4 GB — — — — Windows 2000 Professional/Server: 4 GB — — — — Windows 2000 Advanced Server: 8 GB — — — — Windows 2000 ...
The 2 GB limit refers to a physical memory barrier for a process running on a 32-bit operating system, which can only use a maximum of 2 GB of memory. [1] The problem mainly affects 32-bit versions of operating systems like Microsoft Windows and Linux, although some variants of the latter can overcome this barrier. [2]
Limits on physical memory for 32-bit platforms also depend on the presence and use of Physical Address Extension (PAE), which allows 32-bit systems to use more than 4 GB of physical memory. PAE and 64-bit systems may be able to address up to the full address space of the x86 processor.
The PCI hole or PCI memory hole is a limitation of 32-bit hardware and 32-bit operating systems that causes a computer to appear to have less memory available than is physically installed. [1] This memory addressing limitation and the later workarounds necessary to overcome it are functionally similar to the memory limits of the early 8088 IBM ...
"Windows XP 64-bit Edition is designed to use 64-bit memory addresses" -- I think the maximum memory limit is set to 128 GB in current version, so the addesses probably don't use full 64-bits for memory adressing Helix84 21:57, 26 Apr 2005 (UTC) You are right, updated the page to reflect this.--Yamla 22:16, 2005 May 11 (UTC) Definitely move.