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Windows 7 x64 bit on Alienware m9750 laptop doesn't recognize all 4 gig ram RRS feed

  • Question

  • Hi,

    There is another non-microsoft forum where this topic is discussed - that is - the topic of the Alienware m9750 laptop with windows 7 64bit installed not recognizing all of the memory. It only recognizes 2.75+ Gb of the 4 Gb installed. In the other forum so as not leave out the resutls, it was discussed that the alienware support was varied but the following things were mentioned: a. the chipset is only 32-bit and so wont recognize all 4 gig , and b) the bios having issues.

    Now I consider myself fairly technical and I do know that even for the 32-bit operating systems of windows there is this little known featre of PAE - physical address extension.

    I don't know why on a 64-bit OS like Windows 7 64-bit which installs cleanly on the m9750 laptop that it will not be able to show all 4 gig of ram as available? The only thing I can think of is that for some reason the MOBO architecture is unable to support it but then why would Windows 7 64-bit even install ?

    Regards,

    Russ.

    Saturday, September 4, 2010 1:17 PM

Answers

  • Hi,

    this is a limitation of the Chipset (Mobile Intel® 945PM Express Chipset) of your Laptop. To use the complete 4GB, your chipset must support 8GB of RAM, your only supports 4GB:

    The system memory that is reported in the System Information dialog box in Windows Vista is less than you expect if 4 GB of RAM is installed

    http://support.microsoft.com/kb/929605

    André


    "A programmer is just a tool which converts caffeine into code" CLIP- Stellvertreter http://www.winvistaside.de/
    • Proposed as answer by Andre.Ziegler Saturday, September 4, 2010 2:02 PM
    • Marked as answer by Linda Yan Tuesday, September 7, 2010 9:04 AM
    Saturday, September 4, 2010 2:02 PM

All replies

  • Hi,

    this is a limitation of the Chipset (Mobile Intel® 945PM Express Chipset) of your Laptop. To use the complete 4GB, your chipset must support 8GB of RAM, your only supports 4GB:

    The system memory that is reported in the System Information dialog box in Windows Vista is less than you expect if 4 GB of RAM is installed

    http://support.microsoft.com/kb/929605

    André


    "A programmer is just a tool which converts caffeine into code" CLIP- Stellvertreter http://www.winvistaside.de/
    • Proposed as answer by Andre.Ziegler Saturday, September 4, 2010 2:02 PM
    • Marked as answer by Linda Yan Tuesday, September 7, 2010 9:04 AM
    Saturday, September 4, 2010 2:02 PM
  • Andre, (forgot how to create the correct accent mark above the 'e' ?)

    Thank you for the response, and more importantly, the pointer to the detailed microsoft kb article.

    I have been able to to modify the PAE settings on certain versions of the Windows to get it to use less system memory but the PAE switch is only supported on the 32-bit versions of Windows.

    Regards,

    Russ.

    Tuesday, September 7, 2010 2:30 PM
  • your chipset is the limitation. It doesn't support more RAM. This has nothing to do with PAE.
    "A programmer is just a tool which converts caffeine into code" CLIP- Stellvertreter http://www.winvistaside.de/
    Tuesday, September 7, 2010 11:55 PM
  • Andre,

    Your missing my point. If the limitation is set at 4 Gig given the chipset, then the question is how much of the 4 Gig will be available to the user space.

    With PAE support, you can enable the user space to be larger and the system space to be smaller.

    Russ.

    Wednesday, September 8, 2010 3:54 PM
  • Your missing my point. If the limitation is set at 4 Gig given the chipset, then the question is how much of the 4 Gig will be available to the user space.

    less than 4GB.

    For Windows Vista (applies to 7, too) to use all 4 GB of memory on a computer that has 4 GB of memory installed, the computer must meet the following requirements:
    • The chipset must support at least 8 GB of address space . Chipsets that have this capability include the following:
      • Intel 975X
      • Intel P965
      • Intel 955X on Socket 775
      • Chipsets that support AMD processors that use socket F, socket 940, socket 939, or socket AM2. These chipsets include any AMD socket and CPU combination in which the memory controller resides in the CPU.
    You need at least the P965, not your P945 chipset.

    "A programmer is just a tool which converts caffeine into code" CLIP- Stellvertreter http://www.winvistaside.de/
    Wednesday, September 8, 2010 10:29 PM