MSI P55A Fuzion Memory problem

I have a problem that i am trying to solve so I need your help.
My motherboard MSI P55A Fuzion detects memory 12 GB  Kingmax (2x4GB DDR 3 1600 and 2x2GB DDR3 1600) but my OS is showing 1g GB but 6GB usable memory.
I have googled a couple of topics on that subject but haven't really found the solution.
BIOS version is 1.20, my operating system is a windows 7 64 bit that supports more than 4 GB 
I also tried stacking the memory one by one and with 3 sticks i could get a 10 GB full.
I don't think it's an OS issue since i checked out max memory in advance boot options.
Please help me out, it's really getting on my nerves 
Thanks in advance.
Stija

Mixing memory is the way to make sure you are running into problems. While using four sticks is already maxing stress for the ram controller you are also mixing capacities and different ram srticks. Get a proper matched kit and it will work.

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