.
Question:
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Can XP support 64 bit multi-core processors?
If so, Which versions?
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What is the max RAM memory XP can make use of?
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Is there RAM-Disk software redily available
For XP?
For Win-7?
Any Freeware?
.

Windows XP does have an x64 version and it supports 128 GB of RAM. Take a look at this link for memory limits on Windows OSs.

http://msdn.microsoft.com/en-us/library/windows/desktop/aa366778(v=vs.85).aspx#physical_memory_limits_windows_xp

You should consider a newer operating system. XP is out of support in 2013.

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