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Thread: Detecting DRAM SIZE. 16 Gb RAM installed only 12 usable.




  1. #1
    Join Date
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    Thumbs up Detecting DRAM SIZE. 16 Gb RAM installed only 12 usable.

    I' ve recently upgraded my system RAM, but when I boot it enters in a reboot cycle showing "Detecting DRAM size" and boots again three or four times.
    When Windows finally boot, in propierties It sais 16 Gb RAM installed only 12 usable.

    Could anybody help me?

    Motherboard: GA-EX58-UD3R (rev. 1.0)
    BIOS: 12r
    Processor: i7 920 @2.66 Mhz
    RAM: 16 Gb (4 Modules) khx1600c9d3b1 http://www.kingston.com/datasheets/KHX1600C9D3B1_4G.pdf
    OS: Windows 7 64bits Ultimate.

    Thank you.
    Last edited by ACME_Corp; 04-09-2012 at 10:43 PM.

  2. #2
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    Default Re: Detecting DRAM SIZE. 16 Gb RAM installed only 12 usable.

    what slots are you using?

    have you tested each ram stick one by one to see they are all working? test in any white slot
    Gigabyte z77x UP4-TH F11c Modded Bios
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  3. #3
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    Default Re: Detecting DRAM SIZE. 16 Gb RAM installed only 12 usable.

    I'm using all the slots (4).
    Yes I've tried all the sticks one by one in slot 1, and all are working ok.

  4. #4
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    Default Re: Detecting DRAM SIZE. 16 Gb RAM installed only 12 usable.

    could point to bent cpu socket pins,or not enough qpi/vtt voltage

    which four slots? because you would be running dual channel? i think you can run four slots in tri channel but not sure,the blue or the white ones?
    Gigabyte z77x UP4-TH F11c Modded Bios
    Intel i7 3770k 24/7@4.8ghz 1.38v Turbo llc +0.165v dvid multithreading enabled
    Samsung Green(MV-3V4G3D/US) 8GB @2133mhz 9-10-10-21-1t 1.55v
    Thermalright Silver Arrow Cpu Cooler
    1xSamsung 840 pro 256 Gb SSD windows 8.1 pro 64bit
    1xSamsung f4 HD204UI 2tb hard drive Storage
    Powercolor 7970 3gb V3 @1150mhz core/1700mhz mem,1.150v Accelero aftermarket air cooler 55c max
    Razer Lycosa Keyboard
    Logitech X-530 5.1 Speakers
    Lite-On iHAS124-19 24x Sata DVDRW
    K-World Hybrid DVB-T 210SE Digital T.V Card
    L.G E2260V L.E.D 1920x1080 Monitor
    Xfx Pro 750w silver rated Psu 80+
    Fractal Arc Midi Case

    http://i38.tinypic.com/14myvfa.jpg x58 ud5 <=3.8ghz + 4.2ghz Overclock Template!!
    http://www.youtube.com/user/warren304#p/u Visit Me On Youtube

    Lots Of Gaming Videos With X58 Ud5 System And Gpu On My Youtube Channel!!
    Just Uploaded New Battlefield 4 Video!!!!!!!!!!!!!!!!!!!!!!

  5. #5
    Join Date
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    Default Re: Detecting DRAM SIZE. 16 Gb RAM installed only 12 usable.

    I've watched the CPU Pins and didn't see any bent pin.

    My mobo has only four slots, I'm using all of them.

    According to the manual,it's possible to run 3-channel with four modules (http://i39.tinypic.com/s5vle9.png)

  6. #6
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    Default Re: Detecting DRAM SIZE. 16 Gb RAM installed only 12 usable.

    yes thats right,thers six slots though in total

    what qpi/vtt and dram voltages are you using? you might need more if theres missing memory
    Gigabyte z77x UP4-TH F11c Modded Bios
    Intel i7 3770k 24/7@4.8ghz 1.38v Turbo llc +0.165v dvid multithreading enabled
    Samsung Green(MV-3V4G3D/US) 8GB @2133mhz 9-10-10-21-1t 1.55v
    Thermalright Silver Arrow Cpu Cooler
    1xSamsung 840 pro 256 Gb SSD windows 8.1 pro 64bit
    1xSamsung f4 HD204UI 2tb hard drive Storage
    Powercolor 7970 3gb V3 @1150mhz core/1700mhz mem,1.150v Accelero aftermarket air cooler 55c max
    Razer Lycosa Keyboard
    Logitech X-530 5.1 Speakers
    Lite-On iHAS124-19 24x Sata DVDRW
    K-World Hybrid DVB-T 210SE Digital T.V Card
    L.G E2260V L.E.D 1920x1080 Monitor
    Xfx Pro 750w silver rated Psu 80+
    Fractal Arc Midi Case

    http://i38.tinypic.com/14myvfa.jpg x58 ud5 <=3.8ghz + 4.2ghz Overclock Template!!
    http://www.youtube.com/user/warren304#p/u Visit Me On Youtube

    Lots Of Gaming Videos With X58 Ud5 System And Gpu On My Youtube Channel!!
    Just Uploaded New Battlefield 4 Video!!!!!!!!!!!!!!!!!!!!!!

  7. #7
    Chike is offline Senior Member
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    Default Re: Detecting DRAM SIZE. 16 Gb RAM installed only 12 usable.

    Quote Originally Posted by ACME_Corp View Post
    I've watched the CPU Pins and didn't see any bent pin.
    The pins are in the socket not on the CPU, but don't rush to check them, try VTT first.

  8. #8
    Join Date
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    Default Re: Detecting DRAM SIZE. 16 Gb RAM installed only 12 usable.

    I've opened the case again and took out the cpu to watch the pins (in the socket Chike ) and none of them seemed to be bent, but somehow relocating the CPU seems to made the magic, everithing is working ok, no more "Detecting DRAM size" reboots and all 16 Gb detected in Windows.

    Thank you all.

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