Windows XP Pro - 2 GB RAM limit with Boot Camp

Hello,
I have a MacPro running windows XP Professional, have Boot Camp 2.1 installed, and my computer only sees 2 gb of RAM when I have 4gb RAM installed. OSX sees all 4 gb. I am very frustrated because many of the applications I use only run in Windows. As I know this is an outstanding issue upon further research, has anyone found a way to amend this (aside from switching to Vista 64) or know if Apple is planning to fix this issue? I fear that Apple's intentionally done this
which makes it even more infuriating. This is NOT a Windows issue; we have other machines running XP with 4 GB RAM just fine, which leads me to believe that its a problem with Boot Camp or Apple's EFI (Bios).
Thank you in advance for your input !

Hi,
it's a hard- and a software problem as well.
Since 32-bit Windows has a limited range of adress space (4GB) to use for harware (PCI-E) extensions to use, the avaiable memory to use is diminishing the more expansion slots there are.
With the Mac Pros 4 PCI-E slots which reserve their needed adress range whether they are in use or not, this leads to an avaiable memory of 2GB.
Since 64-bit Windows has not the 4GB limitation, therefor the PCI-E adress ranges do not delimited the amount of useable memory.
XP-64bit would also do this trick, but is not supported by Apple.
Regards
Stefan

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