stops using RAM and starts using disk cache too soon

Microsoft view (Performance Options in Windows XP):
http://support.microsoft.com/default.aspx?scid=kb;en-
us;308417&Product=winxp

I am running on RAM only. My box never complained...

Set Initial and Max to "0"
Restart
Set to No Paging File
Restart twice.

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Low transfat and low carb diet for your pc or How to
optimize Windows XP for the best performance:

http://home.earthlink.net/~rikhardk/How%20to%20optimize%
20Windows%20XP%20for%20t he%20best%20performance.htm

or

http://www.rikhard.com (link in the middle)