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Thread: Not seeing all my RAM

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  1. #1
    Join Date
    Dec 2009
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    11
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    Kubuntu

    Not seeing all my RAM

    Hi,

    My desktop has 4GB RAM and running windows vista, its showing 4GB RAM and checking the BIOS its showing 4GB RAM but Kubuntu is showing 2.71GB RAM!

    It can't be faulty ram as everything else is showing the correct amount?!

    What do I do?

    Andrew

  2. #2
    Join Date
    Jan 2009
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    Re: Not seeing all my RAM

    Run the python script attached to http://ubuntuforums.org/showpost.php...0&postcount=11

    Code:
    $ sudo python check-my-hardware.py
    and post the output here.

    My prediction: you're running 32-bit bit Ubuntu ...

  3. #3
    Join Date
    Dec 2009
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    Kubuntu

    Re: Not seeing all my RAM

    OK, you're root
    ANALYSIS:
    Total of physical memory modules found 4096 MB in 2 memory module(s)
    BIOS offers 4093 MB as usable
    Memory seen by OS 2770 MB
    BIOS version 07/11/2008
    CPU is PAE enabled
    CPU is x86_64 64-bit enabled
    OS is 32-bit
    ADVICE:
    You're running a 32-bit OS on a x86_64 CPU. Use a x86_84 64-bit OS to get access to more memory.


    Damn, and I can't upgrade from 32bit to 64bit can I

  4. #4
    Join Date
    Dec 2009
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    Kubuntu

    Re: Not seeing all my RAM

    I was under the impression that 32bit any OS can see up to 4GB?!

  5. #5
    Join Date
    Jul 2008
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    Birmingham, England
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    2,400

    Re: Not seeing all my RAM

    Nope, only the PAE kernel can support it on 32bit

    You could upgrade to 64bit next time you install but it's rare that I use 4gb ram anyway

  6. #6
    Join Date
    Dec 2009
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    11
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    Kubuntu

    Re: Not seeing all my RAM

    Cheers, I at least know why its not seeing it all now.

    I'll think about going 64bit

    Andrew

  7. #7
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    Re: Not seeing all my RAM

    Quote Originally Posted by doadesweb View Post
    I was under the impression that 32bit any OS can see up to 4GB?!
    Correct; but from 3.2 GB to 4 GB addressing space is used by something else than memory. And the memory originally there is mapped / hoisted above the 4GB limit ... which cannot be see by normal 32-bit kernel.

    If you're running 9.10 Karmic, you can try the 32-bit PAE kernel: http://packages.ubuntu.com/karmic/linux-generic-pae . You can upgrade to that kernel, and then see all 4GB RAM. No need to reinstall a 64-bit kernel.

    Please report back your results.

  8. #8
    Join Date
    Dec 2009
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    11
    Distro
    Kubuntu

    Re: Not seeing all my RAM

    Cool, installing that kernel now gives me 3.92GB RAM.. AWESOME

    Thanks all!!

  9. #9
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    Re: Not seeing all my RAM

    Quote Originally Posted by doadesweb View Post

    <snip>
    windows vista, its showing 4GB RAM and checking the BIOS its showing 4GB RAM but Kubuntu is showing 2.71GB RAM!
    If your Vista is 32-bit and SP1, it will report the *physically* installed memory, not the *usable* memory. See http://support.microsoft.com/kb/946003/

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