Win7 x64 Mem issues

Hey guys...wonder if some one could help me.

I'm running win7 x64, V 7100, and I have 6GB of DDR3, of which sys properties says I have 4GB usable.

See my picture below for how my memory is reported in my system. I have heard that I need to enable remapping in my bios, but I cannot see it (Gigabyte GA-EX58-UD5). Do I seriously need to replace my motherboard just to run this OS?

FYI, yes I have checked msconfig, everything is unchecked, and I have no on-board graphics.


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