Windows detects the installed memory (RAM) 32.0 GB. Then there (16.0 GB usable)

Windows detects the memory (RAM) installed 32.0 GB. Then there (16.0 GB usable). OS is windows 7 64 bit. Why are there only 16.0 GB usable? and how to fix this? Thank you

For 64 bit versions of Windows 7, Home Premium can use a maximum of 16 GB, Professional and Ultimate can use up to 192 GB.

If you want to use all 32GB, upgrade to 64-bit professional or ultimate edition.

Tags: Windows

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    When you are satisfied with your problem is solved, please mark the answer. It helps others see what answered your question.

    If you posted the original question, you can mark the question as yourself have. Just click the mark as answerbutton.
    Source: http://answers.microsoft.com/en-us/page/faq#faqAskQuestion8

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