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Thread: ga-ma790fxt-ud5p, phenom 955 and 4 x 2gb ram issues




  1. #1
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    Default ga-ma790fxt-ud5p, phenom 955 and 4 x 2gb ram issues

    i have a ga-ma790fxt-ud5p with a phenom 955 BE and i want to run 8gb of ram. i did not realise the issues with the amd chip's memory controller before i bought the ram and i was wondering if i could get some pointers on what settings may help me with a stable machine running the full 8gb. the problem is blue screens, lots of them and totaly randomly. sometimes on boot, sometimes once i'm in windows. the blue screen errors are mostly different, but the most common ones are memory related. as soon as i'm only running 4gb, i have no problems. i have tested all 4 sticks of ram and there are no errors popping up on them.. i can run either pair entirely stable, but once both pairs are installed, the issues begin.

    my full specs are:

    gigabyte ga-ma790fxt-ud5p F8c bios
    amd phenom 955 black edition with zalman cpns9700
    8gb (4x2gb) g.skill trident 2000mhz (f3-16000cl9d-4gb)
    e-power xscale 570w psu (ep-570mp)
    512mb xfx 8800gt xxx with thermaltake duo orb
    antec 900 case (lots of air flow)
    windows 7 ultimate x64

    i have tried changing the following:

    ram at speeds of 800/1066/1333 (wont post at 1600)
    setting ram timings manually even at stock speeds
    cpu nb voltage
    ram voltages
    nb voltage
    cpu voltage
    ganged/unganged
    interlaced enabled/disabled
    different power supply


    i have tried different variations of everything i could think of with no luck. the only thing that has worked to achieve stability is to only run 4gb ram.


    i have read of a few people saying 'sure i run 8gb ram, just up te cpu nb voltage' and some even saying with everything set to auto that it works fine. meanwhile i'm just pulling my hair out.

    once again, i realise its a problem with the cpu memory controller, not the motherboard, but i think this is probably a good place to start. i'm also posting a similar thread on the g.skill support forums.

    if anyone has any advice, i'd greatly appreciate it.


    cheers.
    Last edited by noss; 12-24-2009 at 08:20 PM.

  2. #2
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    Default Re: ga-ma790fxt-ud5p, phenom 955 and 4 x 2gb ram issues

    Have you increased memory voltage to factory specifications? Also you may want to try increasing cpu vcore to 1.5v, and cpu nb vid voltage +0.200.
    What are your pc health status settings?
    Code:
    PC Health Status
    Reset Case Open Status [Disabled]
    Case Opened No
    Vcore 1.376V
    DDR3 1.5V 1.536V
    +3.3V 3.328V
    +12V 12.112V
    Current System Temperature 30oC
    Current CPU Temperature 47oC
    Current CPU FAN Speed 3375 RPM
    Current SYSTEM FAN1 Speed 0 RPM
    Current SYSTEM FAN2 Speed 0 RPM
    Current POWER FAN Speed 0 RPM
    CPU Warning Temperature [Disabled]
    CPU FAN Fail Warning [Disabled]
    SYSTEM FAN1 Fail Warning [Disabled]
    SYSTEM FAN2 Fail Warning [Disabled]
    POWER FAN Fail Warning [Disabled]
    CPU Smart FAN Control [Enabled]
    CPU Smart FAN Mode [Auto]
    System Smart FAN Control [Enabled]
    Last edited by artdrivers; 12-25-2009 at 01:01 AM.
    http://forums.tweaktown.com/gigabyte...ench-test.html
    http://www.gigabyte-usa.com/FileList...ios_qflash.pdf
    Phenom II 945 @ 3.2Ghz w/Thermaltake Big Typhoon Pro 14 CPU Cooler
    Gigabyte GA-MA78GM-S2H rev.1.1 F11
    Sapphire 3870HD / 100225L / 512MB / ddr4
    4GB / Kingston / KHX8500D2K2/2GN / 5-5-5-18 / 1066Mhz
    (2) WD Caviar / WD2500AAKS/ 250GB in SATA RAID-0
    (1) WD Caviar / WD2500AAKS/ 250GB in SATA AHCI
    (2) IDE's 1 8XdualDVDRW 1 52x32x52x CDRW
    Antec /Neo HE550 / 550W
    Mid size ATX case with show through panel
    2) 80x80 front fans (1) 120x120 rear fan and small nb fan
    Microsoft comfort curve USB keyboard 2000 ver.1.0
    Logitech G500 USB mouse
    Monitor: CMV937A
    7.1+2 Channel High Definition ALC889A
    Dual boot Windows 7 32bit home & Windows 7 64bit home


  3. #3
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    Default Re: ga-ma790fxt-ud5p, phenom 955 and 4 x 2gb ram issues

    the ram is rated at 1.6v which is what the motherboard runs it at by default.

    i had tried running many variations of the following:

    ddr3 voltage: 1.65 - 1.8v
    cpu nb vid: +0.100 - +0.0375
    cpu vid: 1.375 - 1.4v

    i was a bit wary about raising the voltages higher, but thats just random people's opinions scaring me out of risking my cpu.

    i had tried setting the timings manually as rated on the packaging (9-9-9-27) but windows would not even boot.



    pc health status page looks like so:

    Reset Case Open Status [Disabled]
    Reset Case Open Status [Disabled]
    Vcore 1.344V
    DDR3 1.5V 1.616V
    +3.3V 3.344V
    +12V 11.985V
    Current System Temperature 38oC
    Current CPU Temperature 35oC
    Current CPU FAN Speed 2509 RPM
    Current SYSTEM FAN1 Speed 1771 RPM
    Current SYSTEM FAN2 Speed 0 RPM
    Current NB FAN Speed 0 RPM
    Current POWER FAN Speed 0 RPM
    CPU Warning Temperature [Disabled]
    CPU FAN Fail Warning [Disabled]
    SYSTEM FAN1 Fail Warning [Disabled]
    SYSTEM FAN2 Fail Warning [Disabled]
    POWER FAN Fail Warning [Disabled]
    CPU Smart FAN Control [Disabled]
    CPU Smart FAN Mode [Auto]
    System Smart FAN Control [Enabled]
    cpu fan control is disabled because the fan has its own controller. system fan control is on because the psu has fan speed control that is hooked up to the motherboard.

    i have also tried a different psu (brand new ocz modxtream 750w) as i thought potentially the the 11.98v would be a problem, the voltage drops to 11.85 under 100% load on all 4 cores. the ocz psu ran at 12.16v and unfortunately made no difference.


    edit: i've not had a chance to post anything on the g.skill forums as membership is manually moderated so i have to wait to be approved to post.
    Last edited by noss; 12-26-2009 at 07:57 PM.

  4. #4
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    Default Re: ga-ma790fxt-ud5p, phenom 955 and 4 x 2gb ram issues

    i was a bit wary about raising the voltages higher, but thats just random people's opinions scaring me out of risking my cpu.
    I agree you need some verification. They do make 2 different Phenom2 955 black box editions. You need to find out if your cpu is a C2 or a C3 before adjusting cpu core voltage. (1) (The Majority) AMD Phenom II X4 955 Black Edition - HDZ955FBK4DGI (HDZ955FBGIBOX)
    (2) (Seldom) AMD Phenom II X4 955 - HDX955FBK4DGM
    The cpu voltage control should be set to manual and increased. Windows 7 ultimate has power options that decrease the cpu voltage when in balanced mode. This could be the result of some errors you witnessed.
    Code:
    MB Intelligent Tweaker(M.I.T.)
    CPU Clock Ratio [Auto] 2700 Mhz
    CPU NorthBridge Freq. [Auto] 2000 Mhz
    CPU Host Clock Control [Auto]
    x CPU Frequency (MHz) 200
    PCIE Clock (MHz) [Auto]
    HT Link Frequency [Auto]
    Set Memory Clock [Auto]
    x Memory Clock x6.66 1333Mhz
     DRAM Configuration [Press Enter]
    ******** System Voltage Optimized ********
    System Voltage Control [manual]
    x DDR3 Voltage Control Auto+0.100=1.6
    x NB Voltage Control Auto
    x SB/HT Voltage Control Auto
    x NB/PCIe/PLL Voltage Control Auto
    x CPU NB VID Control manual +0.15 or +0.200
    x CPU Voltage Control manual
    Normal CPU Vcore 1.3500V 1.344+0.156=1.5V
    i had tried setting the timings manually as rated on the packaging (9-9-9-27)
    The looser clocks the more stable the memory.
    When adjusting to 9-9-9-27 you also need to change the row cycle time to 36 or 37. This is Row Precharge Time=9 + Minimum RAS Active Time=27 Row Cycle Time =36 AMD Phenom's usually gives +1 = 37.
    This BIOS feature controls the memory module's Row Cycle Time or tRC. The row cycle time determines the minimum number of clock cycles a memory row takes to complete a full cycle, from row activation up to the precharging of the active row.
    Formula-wise, the row cycle time (tRC) = minimum row active time (tRAS) + row precharge time (tRP). Therefore, it is important to find out what the tRAS and tRP parameters are before setting the row cycle time.
    If the row cycle time is too long, it can reduce performance by unnecessarily delaying the activation of a new row after a completed cycle. Reducing the row cycle time allows a new cycle to begin earlier.
    However, if the row cycle time is too short, a new cycle may be initiated before the active row is sufficiently precharged. When this happens, there may be data loss or corruption.
    For optimal performance, use the lowest value you can, according to the tRC = tRAS + tRP formula. For example, if your memory module's tRAS is 7 clock cycles and its tRP is 4 clock cycles, then the row cycle time or tRC should be 11 clock cycles.
    I would leave the timings on auto untill after you test the memory. I suggest Memtest86+4.0 Memtest86+ - Advanced Memory Diagnostic Tool

    Code:
    DRAM Configuration
    CPU Host Clock Control [Auto]
    x CPU Frequency (MHz) 200
    Set Memory Clock [Auto]
    x Memory Clock x6.66 1333Mhz
    DDR3 Timing Items [Auto] SPD Auto
    x CAS# latency Auto 9T
    x RAS to CAS R/W Delay Auto 9T
    x Row Precharge Time Auto 9T
    x Minimum RAS Active Time Auto 27T
    x 1T/2T Command Timing Auto - - - -
    x TwTr Command Delay Auto 5T 2T
    x Trfc0 for DIMM1 Auto 90ns 90ns
    x Trfc2 for DIMM2 Auto - - - -
    x Trfc1 for DIMM3 Auto - - - -
    x Trfc3 for DIMM4 Auto - - - -
    x Write Recovery Time Auto 10T 10T
    x Precharge Time Auto 3T 3T
    x Row Cycle Time Auto 36T or 37T 
    x RAS to RAS Delay Auto 4T 4T
    I hope this helps. Please let us know.
    Last edited by artdrivers; 12-26-2009 at 09:26 PM.
    http://forums.tweaktown.com/gigabyte...ench-test.html
    http://www.gigabyte-usa.com/FileList...ios_qflash.pdf
    Phenom II 945 @ 3.2Ghz w/Thermaltake Big Typhoon Pro 14 CPU Cooler
    Gigabyte GA-MA78GM-S2H rev.1.1 F11
    Sapphire 3870HD / 100225L / 512MB / ddr4
    4GB / Kingston / KHX8500D2K2/2GN / 5-5-5-18 / 1066Mhz
    (2) WD Caviar / WD2500AAKS/ 250GB in SATA RAID-0
    (1) WD Caviar / WD2500AAKS/ 250GB in SATA AHCI
    (2) IDE's 1 8XdualDVDRW 1 52x32x52x CDRW
    Antec /Neo HE550 / 550W
    Mid size ATX case with show through panel
    2) 80x80 front fans (1) 120x120 rear fan and small nb fan
    Microsoft comfort curve USB keyboard 2000 ver.1.0
    Logitech G500 USB mouse
    Monitor: CMV937A
    7.1+2 Channel High Definition ALC889A
    Dual boot Windows 7 32bit home & Windows 7 64bit home


  5. #5
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    Default Re: ga-ma790fxt-ud5p, phenom 955 and 4 x 2gb ram issues

    sorry to take a while getting back to this.. been a bit busy over christmas.

    i ran memtest on the system, once with each pair of ram installed individually and once with all four sticks of ram installed.

    when each pair was run individually (i.e. 2 sticks installed) i had no errors on either pair. when all four sticks were installed however, i had lots of errors on test #5.


    as for my cpu, its the 955 black edition, according to cpu-z its stepping 2, revision RB-C2, so that would be HDZ955FBK4DGI from the two you posted.

  6. #6
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    Default Re: ga-ma790fxt-ud5p, phenom 955 and 4 x 2gb ram issues

    It sounds like you have a memory slot problem. Have you tried installing memory in just the blue memory slots, and then just the white memory slots? If only some of your memory slots are working. One other possibility is a cpu pin not making good contact with the socket. This is more of a problem on the intel P55 chipset with the foxconn cpu socket. Just the same you may want to remove the heatsink and fan and cpu. Check the pins, clean old thermal paste and install new thermal compond. This could fix this problem.
    Last edited by artdrivers; 01-04-2010 at 04:25 AM.
    http://forums.tweaktown.com/gigabyte...ench-test.html
    http://www.gigabyte-usa.com/FileList...ios_qflash.pdf
    Phenom II 945 @ 3.2Ghz w/Thermaltake Big Typhoon Pro 14 CPU Cooler
    Gigabyte GA-MA78GM-S2H rev.1.1 F11
    Sapphire 3870HD / 100225L / 512MB / ddr4
    4GB / Kingston / KHX8500D2K2/2GN / 5-5-5-18 / 1066Mhz
    (2) WD Caviar / WD2500AAKS/ 250GB in SATA RAID-0
    (1) WD Caviar / WD2500AAKS/ 250GB in SATA AHCI
    (2) IDE's 1 8XdualDVDRW 1 52x32x52x CDRW
    Antec /Neo HE550 / 550W
    Mid size ATX case with show through panel
    2) 80x80 front fans (1) 120x120 rear fan and small nb fan
    Microsoft comfort curve USB keyboard 2000 ver.1.0
    Logitech G500 USB mouse
    Monitor: CMV937A
    7.1+2 Channel High Definition ALC889A
    Dual boot Windows 7 32bit home & Windows 7 64bit home


  7. #7
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    Default Re: ga-ma790fxt-ud5p, phenom 955 and 4 x 2gb ram issues

    I looked up that memory and it's not supported for that motherboard. Did you not check this when purchasing it? Sorry I did'nt notice sooner. ---->
    G.SKILL-Products
    Here is a link of gskill memory that is supported with that motherboard. ---->G.SKILL-SEARCH BY MANUFACTURER MODEL NAME
    Last edited by artdrivers; 01-04-2010 at 05:01 AM.
    http://forums.tweaktown.com/gigabyte...ench-test.html
    http://www.gigabyte-usa.com/FileList...ios_qflash.pdf
    Phenom II 945 @ 3.2Ghz w/Thermaltake Big Typhoon Pro 14 CPU Cooler
    Gigabyte GA-MA78GM-S2H rev.1.1 F11
    Sapphire 3870HD / 100225L / 512MB / ddr4
    4GB / Kingston / KHX8500D2K2/2GN / 5-5-5-18 / 1066Mhz
    (2) WD Caviar / WD2500AAKS/ 250GB in SATA RAID-0
    (1) WD Caviar / WD2500AAKS/ 250GB in SATA AHCI
    (2) IDE's 1 8XdualDVDRW 1 52x32x52x CDRW
    Antec /Neo HE550 / 550W
    Mid size ATX case with show through panel
    2) 80x80 front fans (1) 120x120 rear fan and small nb fan
    Microsoft comfort curve USB keyboard 2000 ver.1.0
    Logitech G500 USB mouse
    Monitor: CMV937A
    7.1+2 Channel High Definition ALC889A
    Dual boot Windows 7 32bit home & Windows 7 64bit home


  8. #8
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    Default Re: ga-ma790fxt-ud5p, phenom 955 and 4 x 2gb ram issues

    that is akin to saying that i cant put mobil oil in my car because bmw recommends castrol.

    thanks for your help anyway.

  9. #9
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    Default Re: ga-ma790fxt-ud5p, phenom 955 and 4 x 2gb ram issues

    I am not talking about switching Brands here. You can get the same brand but it requires a different part number.
    that is akin to saying that i cant put mobil oil in my car because bmw recommends castrol.
    Do you think all BMW parts are interchangeable? This is why they offer a Ram configurator. http://www.gskill.com/configurator.php This is also why they offer so many different part numbers on a specific brand name and series of memory. http://www.gskill.com/configurator2.php?pid=2&model=87
    Last edited by artdrivers; 01-13-2010 at 11:49 PM.
    http://forums.tweaktown.com/gigabyte...ench-test.html
    http://www.gigabyte-usa.com/FileList...ios_qflash.pdf
    Phenom II 945 @ 3.2Ghz w/Thermaltake Big Typhoon Pro 14 CPU Cooler
    Gigabyte GA-MA78GM-S2H rev.1.1 F11
    Sapphire 3870HD / 100225L / 512MB / ddr4
    4GB / Kingston / KHX8500D2K2/2GN / 5-5-5-18 / 1066Mhz
    (2) WD Caviar / WD2500AAKS/ 250GB in SATA RAID-0
    (1) WD Caviar / WD2500AAKS/ 250GB in SATA AHCI
    (2) IDE's 1 8XdualDVDRW 1 52x32x52x CDRW
    Antec /Neo HE550 / 550W
    Mid size ATX case with show through panel
    2) 80x80 front fans (1) 120x120 rear fan and small nb fan
    Microsoft comfort curve USB keyboard 2000 ver.1.0
    Logitech G500 USB mouse
    Monitor: CMV937A
    7.1+2 Channel High Definition ALC889A
    Dual boot Windows 7 32bit home & Windows 7 64bit home


  10. #10
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    Thumbs up Re: ga-ma790fxt-ud5p, phenom 955 and 4 x 2gb ram issues

    gskill tech support solved this in a single response, my system is 100% stable so far, ran memtest with all 4 sticks installed for roughly 7 hours with no errors, i am now typing this while prime95 churns away with all 8gb installed.

    the settings that i used were:

    DDR3-1333
    tCL 8
    tRCD 8
    tRP 8
    tRAS 24
    Command Rate 2
    Memory Voltage 1.60V
    NB VID Voltage 1.40V
    HT Voltage 1.40V
    NB Clock 2200mhz


    gskill tech support only offered the timing and voltage advice, it still did not work with just those settings, but i would get much closer to booting windows than before - it would bluescreen just as the desktop was loading.

    i decided to overclock the northbridge as i mentioned earlier others had apparently done. upped the multiplier one notch to 11 and its perfect.





    thanks again. i hope this info helps someone out in the future.
    Last edited by noss; 01-16-2010 at 04:51 AM.

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