memory above 4 gig???

Discussion in 'Windows Vista Performance' started by joeg561 via, Jun 20, 2007.

  1. I recently increased my memory from 2 gig to 4 gig . use pc3200 ddr2 4 x
    1024 sticks. flashed my bios to the newest release . mother board sees 4 -
    1024 sticks, went into vista and it sees 3.0 gig.. when I do an analysis of
    computer by vista it shows four slots filled with 1024 sticks. don't share
    memory with video card. it has its own 512mb.

    why can't vista see and use entire 4gig???
    joeg561 via, Jun 20, 2007
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  2. joeg561 via

    RickyBobby Guest

    It is your motherboard, not Vista. Some motherboard chipsets have that
    unfortunate limitation when four 1GB memory sticks are used.
    RickyBobby, Jun 20, 2007
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  3. joeg561 via

    Cal Bear '66 Guest

    Vista 32-bit?

    You won't see all 4GB with ANY 32-bit OS.
    Cal Bear '66, Jun 20, 2007
  4. according to manufacturer, abit AV8-3rd eye/AV8 supports 4 gb of ddr 400
    dual channel memory
    joeg561 via, Jun 20, 2007
  5. yep 32 bit, does this mean that vista will not use all 4gb if it can't see it
    and why doesn't vista notify people of this limitation before people spend
    the money on memory. I won't go to 64 bit because of the driver and program
    support problems and from all reports, 64 is not faster than 32 as of yet
    joeg561 via, Jun 20, 2007
  6. joeg561 via

    Cal Bear '66 Guest

    ALL 4GB is being used. But not all is available for running programs.

    You know, of course, that YOU bear the responsibility for understanding the
    limitations of 32-bit OSs.

    Search or Google for the memory limitations of 32-bit OSs and you
    will find thousands of explanations and discussions. Or search these
    newsgroups, especially the vista.general group.

    I Bleed Blue and Gold

    Cal Bear '66, Jun 20, 2007
  7. If you search around, there are a lot of places that tell you that Vista
    (and other 32Bit) doesn't support more than 4GB of address space. There are
    lots of articles saying why.

    64Bit Vista doesn't have too many problems with hardware drivers, unless you
    are running older hardware. I'm among one of the ones that hasn't had any
    issues, and all drivers work fine on my 64 Bit system. Getting better every

    Dustin Harper

    Dustin Harper, Jun 20, 2007
  8. Joeg561

    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:


    Ronnie Vernon
    Microsoft MVP
    Windows Shell/User

    Ronnie Vernon MVP, Jun 20, 2007

  9. No, this isn't at all correct. 32-bit Vista has an address space of
    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, Jun 20, 2007
  10. joeg561 via

    Xenomorph Guest

    why would "Vista" notify anyone of this?

    it's a 32-bit thing.

    the 32-bit platform has been around for a long time, and has always had this

    it's not a Vista thing either, as any 32-bit version of Windows won't work
    with 4 gigs of RAM.

    Xenomorph, Jun 20, 2007
  11. ALL 4GB is being used. But not all is available for running programs.

    No it isn't. The only way to make use of that last 0.8G or so is to use the
    remap facility which some BIOSs support.

    If it's not remapped, it's unuseable because it occupies the same address
    space as the memory-mapped I/O (such as video card, etc).

    Steve Thackery, Jun 20, 2007
  12. joeg561 via

    RickyBobby Guest

    You are correct. The best use of a four memory slot motherboard would be
    two 1GB sticks and two 512MB sticks of the same sort of memory.

    The real best use would probably be two 1GM sticks because Windows can run
    anything promptly with that amount of memory.
    RickyBobby, Jun 20, 2007

  13. Anything? No, not true. If you do significant photo or video editing,
    3GB of memory will very likely provide a significant performance
    improvement over 2GB.
    Ken Blake, MVP, Jun 21, 2007
  14. joeg561 via

    RickyBobby Guest

    I noticed that some of the enthusiasts and pros like yourself do recommend
    two 1GB and two 512MB of memory to maximize the performance without spending
    for memory that will not be used.

    The 3GB memory thing is an oddity and I am surprized that it has gone on
    this long without a resolution.

    I always see video editing being used as an example. If that many people
    are really doing a lot of video editing they should be using a workstation,
    not an ordinary home PC. The vast majority of people use their PC for the
    internet anyhow and that does not take much horsepower.
    RickyBobby, Jun 21, 2007
  15. joeg561 via

    DevilsPGD Guest

    In message <%Eyei.429817$> "RickyBobby"
    There is a resolution, it's called 64-bit.
    DevilsPGD, Jun 21, 2007
  16. joeg561 via

    Mike Mueller Guest


    There ain't too much to resolve. A 32bit system (running Win, Linux, etc)
    only can address 4GB.

    Start with your 4g limit, and them subtract the system devices that have
    memory addresses, such as:
    Video Card
    Sound Card
    NIC card
    Legacy Ports (Com / LPT)
    ....and so on
    And then what is left is what can be seen to the OS of the RAM installed
    Mike Mueller, Jun 21, 2007
  17. joeg561 via

    Fat Bastard Guest

    Nope, the OS is not what is causing the limitation, it is the motherboard.
    Since the motherboard still has to be compatible with 32-bit OS's (not only
    Windows), it has to address 4gb of memory. It then allocates hardware
    starting at the top and working down. If you have 4gb of RAM in the machine,
    the top part will be blocked off by the motherboard and there is nothing in
    any OS that can alleviate this. If the motherboard supports loading hardware
    addresses above 4gb, you can then use 32-bit Windows with PAE enabled and
    you should be fine, but only some very modern motherboards allow this.
    Fat Bastard, Jun 24, 2007
  18. joeg561 via

    Fat Bastard Guest

    Fat Bastard, Jun 24, 2007
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