Ram issue please help

Hello guys i need help with my computer i have installed 16 gb of ram and it shows usable only 8 gb.
I checked in the bios and says usable only 8 gb and in cpuz i see 16 gb.
I checked ms config boot option and the case is uncheckedĀ 
I switch around the ran with no success
I cleared cmos and updated bios to the last version and cleared cmos again.
I am using a asus motherboard p7h55-m intel i5 760 2.80ghz ocz vertex 3 ssd and ram is hynix hmt351u6cfr8c-pb no aa pc3-12800u-11-11-b1

Please help

Check that memory remapping is enabled within the BIOS.

Advance Menu -> Uncore Configuration.