Windows 7 windows 7 intalled memory vs useable memory


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Windows 7-7100x64 displays 6.00 gb of installed memory but states useable is only 1.99gb, Cpu-z reports 6.00gb installed memory. I do not have the feature in my evga x58 mb to change memory mapping or activate/deactivate PAE. any help on this would be great!!
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Can anyone help me ??

Im running 4GB of Ram on Windows 7 Professional, but its saying (3.19) Usable

Anyone know why this is ???