Windows won't recognize half my RAM

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  1. Posts : 16
    Windows 10
       #1

    Windows won't recognize half my RAM


    Both in task manager and system properties it says the installed ram is 16.0 GB and 2 of 4 slots are used. There is an 8.0 GB stick in each of the 4 RAM slots on my mobo and CPUZ agrees, showing 32.0 GB. I've updated my bios, disabled onboard graphics, and tried just about everything in a thread I've found here and elsewhere, nothing works. Any ideas?
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  2. Plankton's Avatar
    Posts : 1,661
    Windows 10 Pro
       #2

    From your spec data sheet.....

    GA-F2A78M-D3H (rev. 3.0) | Motherboard - GIGABYTE Global



    1. 4 x 1.5V DDR3 DIMM sockets supporting up to 64 GB of system memory* The maximum 64 GB of system memory can be supported using 16 GB (or above) memory modules.
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  3. bobkn's Avatar
    Posts : 2,975
    Win 10 X64 Pro 2004 19041.208
       #3

    Plankton said:
    From your spec data sheet.....

    GA-F2A78M-D3H (rev. 3.0) | Motherboard - GIGABYTE Global



    1. 4 x 1.5V DDR3 DIMM sockets supporting up to 64 GB of system memory* The maximum 64 GB of system memory can be supported using 16 GB (or above) memory modules.
    I'm missing the point.

    The OP posted that there are four 8GB Dimms installed. The MB supports up to four 16 GB Dimms.

    Does your post suggest any reason that Windows isn't showing all 32 GB?
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  4. Plankton's Avatar
    Posts : 1,661
    Windows 10 Pro
       #4

    Yes....it states in the blue text.....you have to use 2 x 16 gb ram sticks.
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  5. Posts : 16
    Windows 10
    Thread Starter
       #5

    I see, annoying.

    Guess I need to upgrade motherboard/cpu to use all 32 gb then?
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  6. essenbe's Avatar
    Posts : 12,246
    Windows 10 Pro 1903
       #6

    @Silariuss Please download CPU z and post screenshots (https://www.tenforums.com/tutorials/...en-forums.html ) of the CPU tab, mainboard tab and each of the 4 SPD tabs. On the SPD tab, you can select each Dimm slot from a dropdown in the upper left. Please wshow all 4 slots.I've never heard of a retail motherboard that requires 16 GB ram sticks.
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  7. Berton's Avatar
    Posts : 8,110
    Win10 Home and Pro, Win10 Insider Preview, WinXP Home Premium, Linux Mint, Win7 Pro
       #7

    Here's the page from Crucial about the RAM combinations possibilities:
    RAM SSD Upgrades | GIGABYTE GA-F2A78M-D3H | Crucial.com
    To get Dual-Channel does require a matched pair but may be best if all 4 are matched.
    Maximum RAM support in Windows 10:
    Whats the maximum RAM support for Windows 10 Home Edition and - Microsoft Community
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  8. flybynite's Avatar
    Posts : 2,777
    Windows 10 ProWorkstation -- Whichever is highest build number.
       #8

    Silariuss said:
    I see, annoying.

    Guess I need to upgrade motherboard/cpu to use all 32 gb then?
    Just buy different RAM.
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  9. Posts : 186
    Windows 10 Pro x64
       #9

    Does the motherboard's UEFI recognize that you have 4 sticks of ram and show 32GBs or 32/768?
    If not there's your problem.
    Windows only recognizes the hardware that your motherboard's UEFI does, as far as cpu, mobo, ram, usb2/3/3.1, lan/wi-fi, sound and video.
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  10. Posts : 16
    Windows 10
    Thread Starter
       #10

    Windows won't recognize half my RAM-cpu.png
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