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Thread: Missing RAM on X58A-UD3R; 6GB installed (4GB useable)




  1. #1
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    Default Missing RAM on X58A-UD3R; 6GB installed (4GB useable)

    I can't get my motherboard to recognize all of my installed RAM, which seems to be a fairly common problem. I just got the cpu/mobo/ram three days ago and I'd like to not return them, but I'm running out of ideas.

    Any advice on how to fix this would be greatly appreciated.


    Here's what I've tried so far:
    * Reseated the cpu several times, no hint of damage
    * Reseated the ram several times, no hint of damage
    * Loosened cpu heatsink/fan (a CM Hyper212Plus)
    * Installed the stock heatsink/fan (gasp!)
    * Many bios configurations, but I'm not an expert so I likely missed something
    * Removed all non-essential components from computer
    * Installed each ram module individually, each works solo (2gb)
    * Installed pairs of modules, shows 4gb installed 2gb useable
    * All 3 modules show 6gb installed 4gb useable
    ! Usually the last channel (B for 2 modules, C for 3 modules) shows "-" values for timings in bios. Channel A never shows "-", and sometimes no channels show "-".


    Machine specs:
    CPU = Intel i7 920
    Motherboard = X58A-UD3R, rev 1.0
    BIOS = Award F5
    RAM = OCZ3G1600LV2G

    BIOS details (I think these are all values from the Optimal profile):
    Code:
     
     
    Advanced CPU Features:
    CPU Clock Ratio ................................ [20x]
    Intel(R) Turbo Boost Tech .................. [Enabled]
    CPU Cores Enabled ............................ [All]
    CPU Multi Threading .......................... [Enabled]
    CPU Enhanced Halt (C1E) ................... [Enabled]
    C3/C6/C7 State Support .................... [Disabled]
    CPU Thermal Monitor ......................... [Enabled]
    CPU EIST Function ............................ [Enabled]
    Virtualization Technology ................... [Enabled] << Disabled if you do not use Vmware or Virtual PC Programs
    Bi-Directional PROCHOT ..................... [Enabled]
     
    Uncore & QPI Features:
    QPI Link Speed .............................. Auto
    Uncore Frequency ..........................  Auto
    Isonchronous Frequency ..................[Enabled]
     
    Standard Clock Control:
    Base Clock (BCLK) Control ................ [Disabled]
    BCLK Frequency (MHz) .....................
    PCI Express Frequency (MHz) ........... [Auto]
    C.I.A.2 Not Found
    Advanced Clock Control:
    CPU Clock Drive ..............................[800mV]
    PCI Express Clock Drive ................... [900mV]
    CPU Clock Skew ............................. [0ps]
    IOH Clock Skew ............................. [0ps]
     
    Advanced DRAM Features:
    Performance Enhance ...................... [Turbo]
    Extreme Memory Profile (X.M.P) ......... Not found
    System Memory Multiplier (SPD) ........ [AUTO]
    DRAM Timing Selectable (SPD) .......... [Auto]
    Channel A + B + C
     
    Values in {Braces} are Automatics
     
    Channel A Timing Settings:
    ##Channel A Standard Timing Control##
    CAS Latency Time ......................{7}
    tRCD .......................................{7}
    tRP .........................................{7}
    tRAS .......................................{16}
    Below values may be left in Auto if you like, generally this is fine.  For those users who DO Set advanced timings manually, please see some of my thoughts and findings about these settings and rules here
    XtremeSystems Forums - View Single Post - Gigabyte EX58-UD5/Extreme Discussion Thread
    ##Channel A Advanced Timing Control##
    tRC ........................................{27}  (Should be = tRAS + tRP or above for stability)
    tRRD .......................................{4}
    tWTR ......................................{4} (Must be Write to Read Delay/Same Rank - (tWL + 4)
    tWR ........................................{8}
    tWTP .......................................{19}   (tWTP Must = tWR + tWL + 4)
    tWL ........................................{7}    (tWL Must be CAS Latency -1)
    tRFC .......................................{60}
    tRTP .......................................{4}
    tFAW ......................................{16}
    Command Rate (CMD) ................{}
    ##Channel A Misc Timing Control##
    Round Trip Latency ...................
     
    Advanced Voltage Control:
    CPU
    Load Line Calibration ................. [Standard]
    CPU Vcore ...............................[AUTO]
    QPI/VTT Voltage 1.150v ............[AUTO]
    CPU PLL 1.800v .......................[AUTO]
    MCH/ICH
    PCIE 1.500v ...........................[AUTO]
    QPI PLL 1.100v .......................[AUTO]
    IOH Core 1.100v .....................[AUTO]
    ICH I/O 1.500v .......................[AUTO]
    ICH Core 1.1v ........................[AUTO]
    DRAM
    DRAM Voltage 1.500v ..............[AUTO]
    DRAM Termination 0.750v [AUTO]
    Ch-A Data VRef. 0.750v [AUTO]
    Ch-B Data VRef. 0.750v [AUTO]
    Ch-C Data VRef. 0.750v [AUTO]
    Ch-A Address VRef. 0.750v [AUTO]
    Ch-B Address VRef. 0.750v [AUTO]
    Ch-C Address VRef. 0.750v [AUTO]

  2. #2
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    Default Re: Missing RAM on X58A-UD3R; 6GB installed (4GB useable)

    youve tried each stick one at a time in each white slot?it should boot from any white slot with just one stick installed/test each slot/ram stick.....also try typing msconfig/boot/advanced and maksure all memory box is unticked,also look in task manager/resource monitor and see what it says,this is what it should looklike




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  3. #3
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    Default Re: Missing RAM on X58A-UD3R; 6GB installed (4GB useable)

    Wazza, thanks for the advice.

    I set out to try the 9 different combinations of slot/module and the fourth iteration turned up what appears to be a bad ram module. The suspect stick won't boot in any slot, and the other two will. Also, with the good two installed the system starts up with 4GB.

    So this looks like a simple case of a bad ram module...
    OR
    Maybe the module was broken from all the testing and it's now hiding the original problem. (I sure I tested them before separately, but then again they do all look alike)

    Either way, it looks like I'll be replacing the ram. If I then get 6GB everything will be fine. If it's 4 of 6, then I'll have to start this all over again.

    Is there a bios switch/upgrade that could be affecting just one of the 3 ram modules?

    Thanks again.

  4. #4
    Lsdmeasap's Avatar
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    Default Re: Missing RAM on X58A-UD3R; 6GB installed (4GB useable)

    Sounds like you have a faulty module to me, from what you have found testing. Each stick should boot normally by itself in any of the white slots, if one stick fails to boot in any of those it but the others are fine then that stick is faulty.

  5. #5
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    Red face Re: Missing RAM on X58A-UD3R; 6GB installed (4GB useable)

    I had the same problem twice and it was a seating problem in both cases! However, I managed to identify which module was not detected by the system from the CMOS Setup Utility (BIOS).
    From the M.I.T screen (MIB Intelligent Tweaker) scroll down to the DDR channels timing values and you would see that for the faulty or problematic module the values are either missing or different from the rest.

  6. #6
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    Default Re: Missing RAM on X58A-UD3R; 6GB installed (4GB useable)

    Any luck yet?

    Sorry I did not mention before, you need to set your own Ram voltage manually, and find the correct QPI/Vtt manually (Usually 1.2-1.4 for 1600Mhz). It's also best to set your own uncore multi, 2x ram multi or above.

  7. #7
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    Default Re: Missing RAM on X58A-UD3R; 6GB installed (4GB useable)

    Yep, I solved my problem too.....it was a module problem...replaced it and now have 6GB of usable RAM :) Also, had found a good article at windows7library site.

  8. #8
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