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Thread: P55A-UD6: hangs and BSODs when using 8GB

  1. #1
    Join Date
    Sep 2010

    Default P55A-UD6: hangs and BSODs when using 8GB

    Can anyone help me with getting my BIOS settings to match my memory?

    I recently assembled a PC using:
    GA-P55A-UD6 motherboard
    Intel i7-860 processor
    Crucial memory - 4x2GB CT25664BA1339 from Gigabyte's supported list
    500W power supply
    1 HDD, 1 SSD, 1 DVD

    The memory is DDR3-1333, PC3-10600, 1.5V, 9-9-9-24
    CT2KIT25664BA1339 - 4GB kit (2GBx2), 240-pin DIMM , DDR3 PC3-10600 from Crucial.comUS

    If I only install 2 DIMMs (4GB), the system is stable; never a problem. I've tried all four sticks in pairs, both pairs work fine individually. I was able to install Windows Server 2008 R2 with no issues and run memtest86 with no problems found.

    With 4 DIMMs (8GB), the system freezes or BSODs contantly. I've got the DIMMs in the correct slots according to the manual.

    I've installed the lated BIOS (F11) and used Load Optimized Defaults.

    Someone in a different forum recommeded the following:
    Performance Enhance to Standard
    DRAM Timing Selectable to Expert
    tRFC increased by 15% (74 to 86)
    Command rate to 2
    QPI/Vtt voltage to 1.2V
    DRAM voltage to 1.54V

    These settings actually seemed to help for a while when using 8GB, but the stability degraded over time as software and OS fixes were installed to the point where I can't even boot with 8GB installed. The system is still rock solid with 4GB, however.

    I can see the 9-9-9-24 in the BIOS, so I know the SPD is being read correctly.

    I'm not trying to overclock, just trying to get my memory to work!

    Any help is greatly appreciated.

  2. #2
    Acebmxer's Avatar
    Acebmxer is offline Gigabyte Elite
    Join Date
    May 2009
    New Jersey, United States

    Default Re: P55A-UD6: hangs and BSODs when using 8GB

    What BSOD are you getting you may need to add more QPI/Vtt. Look at my signature for BSOD codes and what will help to fix them.

    I see you have 1.2v for Vtt try something around 1.3 for starters if your BSOD code is 124.

    Side note 2 separate 4gb kits may not work together.
    Main Rig
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    Samsung Green 8GB 2x4GB MV-3V4G3D/US DDR3 1.3v 30nn @ 2200Mhz 11-11-11-32 1.60v
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