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Asus P5B-Vista Edition Twin2X6400 Trying to run 4GB in Vista


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There's this option in the BIOS which asks if I want to virtually extend the memory. When I have it on it shows 4GB on the BIOS and 2GB in Windows, and when I have it off it shows 3GB in Windows and the BIOS.


I think the problem is to do with PME (Physical Memory Extension) but I'm not 100% sure.


Any suggestions are appreciated. Thanks.

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