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P5B Premium only showing 3GB instead of 4GB on Vista


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I just put together a new system which included:


P5B Premium Vista Edition

2 TWIN2X2048-6400C4 2GB Kit DDR2-800 XMS2-6400 Xtreme Performance Memory (total 4GB)

Vista Ultimate 32bit



I know the max in vista 32bit is 4gb but it won't even recognize that. CPUID shows all 4 fine. I have ran memtest and all modules check out. In the BIOS of the MB it also only shows 3GB so I'll assume this is a ASUS MB issue but figured I would start here and see if anyone has any suggestion especially Ram Guy.

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