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

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.
Windows XP

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Brian Pierce

8/22/2022 - Mon