I have to admit that I don't know that much about virtual memory management and the page file in Windows XP. The best information I have found is here:
http://aumha.org/win5/a/xpvm.htm , and I consider this to be a bit vague for my purposes.
Without using the ramdisk, I find that WinXP will NOT use all the available memory before starting to use the page file, according to MemInfo and also according to SysInternals Process Explorer. For example, I may have around 200MB of free memory in RAM, while the page file usage will be at around 150+MB. I cannot think of a logical explanation for this.
So, from my limited knowledge, I would ask for page file usage statistics and concurrent RAM usage statistics, so I can get some hard data on several systems, then, publish the results for all to see in the newsgroups. It will also be helpful in determining how much RAM my computer support clients need.
Best regards,
Marcos