Forget XP Pro 64! Even eith Vista's 64bit Ultimate edition the full 8gb won't be available due to limitattions imposed by the current chipsets on boards. You may see roughly 7gb for the total.
The max that Vista's 64bit editions can realize is 8gb. For XP 2-3gb tops is all anyone will need unless working with CAD development softwares or something like software design with intense graphics. For the rest that is simply overkill there.
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