I am having the same issue, Windows 8 OS SBT 990FX Mobo, 2x8gb corsair veng with crossfired r9 270x

It is showing only 3gb out of 16gb usable, and I have a 32-bit os running and trying to get it at 64-bit
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More about issue windows sbt 990fx mobo 2x8gb corsair veng crossfired 270x
  1. 32 bit only can use and show max 3gb ram. Install 64 bit then you'll see your 16gb
  2. So having trouble loading 64bit Win? Try with 1 GPU and 1 stick of DRAM
  3. How would I transfer from a 32-bit to a 64-bit?
  4. Buy and install Windows 7, 8 or 8.1 64 bit
  5. Best answer
    There is no transfer or upgrade, it will require a new full install of OS and apps, you can make a backup of you data and then add it to the new install.
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