Sorry if I missed the post if someone already has said it:

XP and VISTA can only "see" up to 4gb RAM.

The exception to the rule is the 64-bit version of these OS; however, there 
is a trade off in compatibility issues should you decide to go with a 64-bit 
operating system any time soon.

I just wanted to put it out there so someone doesn't make the same mistake 
as I did when I bumped my computer from 4gb to 8gb RAM and found myself 
scratching my head asking, "where arrrrrre you, $140 worth of new RAM????" 
<grin>

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