Windows 10 20H2 build 19042.964 only sees 24GB of 32GB installed RAM


  1. Posts : 1
    Win 10
       #1

    Windows 10 20H2 build 19042.964 only sees 24GB of 32GB installed RAM


    Hi,
    I am using an Asus X299 TUF Mark 1 MOBO with the latest BIOS and memory modules from the QVL list.
    All four sticks are OK when installed individually.
    CPU-Z sees all four but OS reports only 3 slots are occupied.
    BIOS also recognizes all four modules.
    Any ideas?
      My Computer


  2. Posts : 3,957
    Windows 7 HP 64 - Windows 10 Pro - Lubuntu
       #2

    Welcome to the Forum.

    Please edit your profile with ALL your hardware specs. It will help us to help you
    System Specs - Fill in at Ten Forums

    Are all memory same brand and model?
    Download, extract and run HWInfo
    Close the summary. Select memory. Take a screen shot and post here as an image.
    Windows 10 20H2 build 19042.964 only sees 24GB of 32GB installed RAM-hwinfo.jpg
      My Computers


  3. Posts : 4,424
    Win 11 Pro 22000.652
       #3

    Stupid question: do you have the DIMMs installed per the manual?

    Windows 10 20H2 build 19042.964 only sees 24GB of 32GB installed RAM-dimms.png

    Which CPU are you using? 4 core supports dual channel RAM, 6 core and up quad channel.

    You could try booting the PC with a single DIMM. Try the DIMM in each of the four slots you've used. (I know that there will be a specific slot recommended for a single DIMM, but I hope that the PC will boot with a stick in an arbitrary slot.)

    I had something similar with an AMD based system. Turned out to be a defective CPU socket. I suppose that something similar could happen with an Intel LGA system. The similarity is that I believe the memory controller on current AMD and Intel models resides on the CPU, not the motherboard chipset.

    Best of luck.
      My Computers


 

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