Windows Vista 32 Bit only shows 3GB of 4GB of ram in the system

Discussion in 'Windows Vista Performance' started by johnwbrock, May 26, 2007.

  1. johnwbrock

    johnwbrock Guest

    My bios shows all 4 gigs of the ram but for some reason my windows only
    detects 3 gigs.

    Does anyone know how to correct this? My motherboard is a Gigabyte
    GA-59SLI-G5 so i know that isnt the issue. Is it just a flat out bug in
    Vista because it should read all 4GB of ram. Also, Im running 2 Nvidia
    GeForce 7950 GT Superclocked graphic cards with 512 MB of ram each so its not
    stealing ram for resources. The Ram is 4 1G Crossair PC gaming sticks.

    When I first installed the ram and then installed vista it only showed up
    with 1 GB of ram. I then removed one stick of ram and rebooted it. It then
    showed up with 3 GB of ram. I then installed the 4 stick back in and
    restarted and it still only shows 3 GB of ram.
     
    johnwbrock, May 26, 2007
    #1
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  2. johnwbrock

    Rock Guest

    I assume you're running the 32bit version of Vista. This is normal. The
    system will use all RAM up to 4GB, but some is used by the hardware, and
    thus not seen in Vista. The exact amount that's not available to the OS
    depends on the specific hardware. Normally Vista (or XP) will see between
    2.7GB and 3.5GB.

    Search the newsgroup posts for this issue or do a Google search. It's been
    discussed many times.
     
    Rock, May 26, 2007
    #2
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  3. 32-bit XP can use up to 4GB. However the 4GB address space has to be
    shared with memory used for other devices. So Windows (not just XP but
    all 32-bit versions, including 32-bit Vista) can't use that entire 4GB
    for itself.

    How much it can use is around 3GB, but depends on what devices are
    installed. It's normally a little more than 3GB. So installing more
    than about 3GB of RAM is usually a waste of money.
     
    Ken Blake, MVP, May 26, 2007
    #3
  4. johnwbrock

    Conor Guest

    Install Vista x64.

    Vista x86 can only address 4GB RAM. Each hardware device has its own
    memory address range it uses. This is subtracted from the 4GB RAM so
    that it can still be addressed. What you're left with is 4GB - Memory
    devices use.
     
    Conor, May 26, 2007
    #4
  5. johnwbrock

    Hertz_Donut Guest

    You are running the 32 bit version of Vista. In order to natively access
    greater than 3GB, you have to run the 64 bit version of Vista.

    Honu
     
    Hertz_Donut, May 27, 2007
    #5
  6. John

    Here is an article that details why you are seeing less RAM than you expect.

    Windows Vista reports less than you expect if 4 GB of RAM is installed
    http://support.microsoft.com/kb/929605
     
    Ronnie Vernon MVP, May 28, 2007
    #6
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