12gb of ram installed but only see 8gb

I currently have 12gb of Corsair triple channel ram installed in a GA-X58A-UD3R but the bios only shows 8gb. When in Windows7 64-bit I show 12 installed but only 8gb available and from that I then lose the normal stuff for hardware reserved. Am I missing something here. I have moved the ram around and nothing changed. I had this issue when I first had only 6g installed but added 6 more and nothing seems to change. Any ideas?
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  1. Hello and welcome to the forums :)
    What is the version of your OS ? (Basic,Premium....) ?
  2. Click the Start orb, and type in msconfig.

    Right click the msconfig app to run it as Administrator. That brings up the configuration utility.

    Click the Boot tab, and then click the Advanced Options button.

    In that window, there is a setting for Maximum Memory - Make sure the checkbox for it is clear (not checked), then reboot your computer.
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