How much memory XP can handle depends on whether it's 32-bit or 64-bit Windows XP. The 32-bit version (which I can guarantee is the one you have) can hold a maximum of 4GB and the 64-bit version can hold a maximum of 128GB of ram. How much memory your particular system can hold (up to the limits imposed by XP itself) is also determined by the motherboard in that system.
The RAM limit on 32-bit XP is 4GB total - including video.
XP x64 128 Gb
Vista x64 8 to 128+ Gb depending on Version
Microsoft Windows Server 2003 R2 Enterprise Edition - 128 MB of RAM minimum required; 256 MB or more recommended; 64 GB maximum for x86-based computers; 2 TB maximum for x64 and ia64 computers
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