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Win7 doesn't seem to utilize all RAM

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    Win7 doesn't seem to utilize all RAM

    I have 6 GB of RAM in my machine (3 2GB sticks). Windows reports all three, but shows only 4 GB total. The best I can find out is that my video card is grabbing 2 GB for something.

    I ran the AUBenchmark in Revit ARCH and compared it to others posted on this blog and everyone else's computer shows the same amount of Physical Memory as is installed.

    Anyone have any idea why I can't get my computer to use the other 2 GB of RAM?

    Below is my benchmark results where you can see the amount of RAM reported:

    AUBenchmark (RAC) v2.04.2011 run @ 3/7/2011 10:03:44 AM

    6, opening and loading the custom template
    11, creating the floors levels and grids
    32, creating a group of walls and doors
    53, modifying the group by adding a curtain wall
    25, creating the exterior curtain wall
    12, creating the sections
    13, changing the curtain wall panel type
    48, create 3d view and render
    37, export all views
    189, TOTAL w/o Render
    237, TOTAL

    OS: Microsoft Windows 7 Professional 64-bit

    CPU: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz
    Max Clock Speed: 2.65 GHz
    Number of Processors: 1
    Number of Logical Processors: 8

    Total Physical Memory: 3.99 GB
    Bank0/1: 2.00 GB @ 1033 MHz
    Bank4/5: 2.00 GB @ 1033 MHz
    Bank8/9: 2.00 GB @ 1033 MHz

    Graphics Card: NVIDIA GeForce GTX 260
    Graphics RAM: 896 MB
    Driver version:

    There should be settings in your BIOS to control how much system memory your video card is using. I would not recommend setting it very low as your system memory is used by the video card to help increase the speed of on screen regeneration. If you are using a Dell or HP box those settings may also be locked out.


      Do you have one of the newer Intel CPUs?

      I've been told, and I may be wrong, but they have triple-channel memory controller. Meaning for some operations the memory must be installed in 3's. So the 4th would be ignored, at least by the system memory - not sure if the Graphics Card could make use.

      That said, your post indicates that you have it installed in 3 any way. But I do know that this is an issue with the i7 - 9 series, so it may be one place to look.

      Like hypnox1 said, the bios should give some clues.

      New posters by the way!


        Rraybon, my guess is that the AUBenchmark is just reporting it incorrectly.

        Go to your Control Panel and open up "System" and it should tell you the correct amount of RAM installed. Also check the Windows Task manager. If both of those show 6GB of RAM, then don't worry any further about it.

        The other thing that seems slightly odd about the "report" is that the banks the modules are installed in seems a little out of order... you might double check that they're installed in the correct banks per the system manufacturers (or motherboard manufacturers) recommendations.

        Also, unless the video card is explicitly sharing RAM, e.g. an integrated video chipset (the setting would be in the BIOS) or one of those cheap "Turbo" cards from about five or six years ago, the video card would not be sharing RAM. I'm almost certain that any i7-9xx series MB wouldn't even have such an option, and the GF 260 is definitely not "sharing" RAM.


          Originally posted by rraybon View Post
          Try installing the RAM in


          Try to find either in your motherboard maunal or on the motherboard, how the DIMM slots are grouped.

          I think you have Tripple Channel set up and only 2 of the DIMM slots for tripple channel used.
          -Alex Cunningham


            I think Alex hit it on the head. With any multi channel RAM you have to make sure of what banks everything goes in. Maybe the motherboard has different colored slots, three in each color, to let you know where a set of three sticks should go.
            If that is not the case, it may very well be that the benchmark is reporting things wrong. But if that is the case, then Microsoft's WMI stuff is the culprit. If verifying the RAM placement doesn't change anything let us know so I can look into it.

            Pragmatic Praxis


              My IT guy and I have been all thru the bios and changed every setting that could possibly be changed, but nothing fixed the problem (not sure it is really a problem). We updated the bios also, but no new settings or parameters showed up. I am not so sure it is a big deal anyway because the benchmark scores aren't that bad compared to some of the others I am seeing. I guess it is using all of it in some way or another.


                how much RAM does Task Manager report? Look at the Total value under Physical Memory (MB). It should be around 6000. If it is close to 4000 then I suspect the third stick isn't getting used for anything. The GTX 260 doesn't use shared RAM, and 64 bit windows does all of its graphic RAM memory mapping well outside of physical RAM mapping. Or at least it should. I wonder if trying a different graphics card driver will have any impact?

                Pragmatic Praxis


                  They are color coded and we have tried it in both series of slots, even mixing up the different sticks in various slots to see if one was bad, but although it see all of them and reports their sizes correctly, it is still yanking 2 GB for something else.

                  Attached is a clip of the system properties as reported from the Nvidia control panel:


                    Originally posted by rraybon View Post
                    you are going to have to attach the image or use a image hosting site for a img/img link

                    what mobo do you have?
                    what does cpu-z show for the ram slots?


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