I installed 8gb ram (4gb dual) but shows that i only have 4.00gb usable.

Jan 12, 2014
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I've tried switching their places, going to bios and put the frequency from 1600mhz to 1333mhz, searching other webs for solutions.

My Specs:
Intel i5 2320 3.0Ghz
AsusTek P8H61 M-LE
Ripjaws G.skill 4gb dual 1600 CL9
Palit GTX 750 StormX gddr5 2gb
Seagate Barracuda 160gb