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12GB RAM installed, but only 8GB RAM showing. How come?


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Just a warning, I'm pretty ignorant about these things and I'm trying to learn...


Basically I bought a custom made PC online a month ago and it came with 6GB of RAM (CORSAIR TR3X6G1600C9). The motherboard is a Rampage II GENE. So with three empty slots and a good deal I found on some CORSAIR TR3X6G1600C9 chips I bought an extra 6 GB of RAM.


I put them in but now Vista Ultimate (64 bit edition) only sees 8 GB of RAM when I check my computer properties. Why is that?

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Can you tell me the bios settings you have set for both CPU and memory and any performance settings that you may have set?


With 6 modules I would suggest setting the memory frequency at DDR1066 or DDR1333 and set the memory Voltage to 1.65 Volts and set the QPI Voltage to 1.6 Volts as well and test the system with http://www.memtest.org. In addition, with some MB's (Mostly ASUS) you have to disable legacy USB in the bios when running any memory test.

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