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Sure this has probably been answered already, but all of the results I'm getting just say that Windows XP tops out at 3-3.5GB of RAM. &nbsp;My question is why doesn't the /PAE switch behave in WinXP as it does in Win2003? &nbsp;I have a 32-bit WinXP box w/ 4GB and the OS sees 3.25GB, I have a 32-bit Server 2003 box w/ 6GB and it sees all 6GB. &nbsp;Everyone says to switch to a 64-bit OS to see all the memory, but I'm not understanding why 32-bit Windows server has no issues at all with supporting large memory configurations.
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Sure this has probably been answered already, but all of the results I'm getting just say that Windows XP tops out at 3-3.5GB of RAM.  My question is why doesn't the /PAE switch behave in WinXP as it does in Win2003?  I have a 32-bit WinXP box w/ 4GB and the OS sees 3.25GB, I have a 32-bit Server 2003 box w/ 6GB and it sees all 6GB.  Everyone says to switch to a 64-bit OS to see all the memory, but I'm not understanding why 32-bit Windows server has no issues at all with supporting large memory configurations.

Why doesn't /PAE support large amounts of RAM in XP like it does in server?

Microsoft Windows XP is the sixth release of the NT series of operating systems, and was the first to be marketed in a variety of editions: XP Home and XP Professional, designed for business and power users. The advanced features in XP Professional are generally disabled in Home Edition, but are there and can be activated. There were two 64-bit editions, an embedded edition and a tablet edition.