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Thread: Strange memory errors on GA-EP45-DS3P




  1. #1

    Default Strange memory errors on GA-EP45-DS3P

    Hi, I'm running Fedora 9 on a Core 2 Quad 2.4Ghz with 2x1GB memory, and I'm getting some odd things. The system boots fine and runs for a while. Then at some point (which may well be associated with backing up to my USB hard drive) the system locks up hard. If I immediately reboot with Memtest86+ then it shows a cluster of memory errors.

    When I first saw this I tried testing each stick individually, but could not produce any errors. So I put them both back in and ran Memtest for a few hours, with no problems. So I rebooted Linux. Everything seemed fine, so I started my (now long overdue) backup. It hung after a few gigabytes, and rebooting with Memtest86+ showed the memory errors were back.

    I think the problem is temporarily cleared by a power cycle. When I tried playing with the RAM timings in the BIOS I noticed that the power cycled automatically when I exited the BIOS screen. This leads me to suspect that something is inadvertently tweaking the RAM parameters in the BIOS. One possibility is a kernel bug in the Linux USB driver.

    I'm using Corsair RAM. On it is printed 1066MHz 5-5-5-15, 2.2v. This matches the BIOS settings except for the voltage, which the BIOS is setting automatically at 1.8v. There are big red warnings about over-voltage, so I'm nervous. When Memtest was giving errors I pushed it up to 1.9v, but that seemed to make the problem worse rather than better.

    So: some questions:

    1: Has anyone seen anything like this before?

    2: Should I ignore the warnings and set the RAM voltage to 2.2? If I do so and it is wrong, could this damage anything other than the RAM?

    3: Is it possible for an OS kernel to modify the RAM parameters "on the fly"? If so then I'll pursue this option.
    Last edited by Paul Johnson; 09-16-2008 at 04:39 AM. Reason: minor correction

  2. #2
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    Default Re: Strange memory errors on GA-EP45-DS3P

    I think you'll find many, many people with similar configurations to yours who have had similar problems when memory voltages and timings are not set correctly. It's very common for the system to be more forgiving with one stick of RAM, but not two. I would manually set the timings and voltages to the specs on your RAM. The auto settings rarely work with these boards.
    I don't see any connection to the Linux kernel modifying the BIOS settings. Just set your DRAM voltage to 2.2v and see if that fixes it. You could add 0.1-0.2v to MCH Core, but I've found that auto lifts that up correctly anyway. Beyond that, LSD will help you tweak your memory settings further, if you want.
    Gigabyte GA-EP45-DS3L (BIOS F9); E7200 Core2Duo 2.53Ghz 1066Mhz FSB 3MB L2 (OC to 3.4Ghz); SuperTalent 2x2G DDR2-800 PC6400 CL 5-5-5-12 (T800UX4GC5); Seagate 500GB SATA2 7200 32mb cache HD; EVGA 8800GT 512MB Superclocked Edition
    Ultra X-connect X2 550-watt PSU; Vista x64 SP1 and OpenSUSE 11.0 (KDE 4.1)

  3. #3
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    Default Re: Strange memory errors on GA-EP45-DS3P

    Before changing any voltages, I would recommend that if you have the setting "Performance Enhance" in the M.I.T. settings screen of the bios, that you set it to "Standard", then run memtest.

    There is no point pushing your Ram straight to the maximum allowable voltage either. Checkout the corsair forums and/or leave a message for other members there or the "Ram guy" to advise you on the best settings for your board and the specific corsair memory you have.
    A search on there though often provides the information you require.
    Last edited by VorLonUK; 09-16-2008 at 07:37 AM.

  4. #4
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    Default Re: Strange memory errors on GA-EP45-DS3P

    For completeness, grab the BIOS template from another post around here and post your full specs and BIOS settings. That will make it much easier for people to help you.
    Gigabyte GA-EP45-DS3L (BIOS F9); E7200 Core2Duo 2.53Ghz 1066Mhz FSB 3MB L2 (OC to 3.4Ghz); SuperTalent 2x2G DDR2-800 PC6400 CL 5-5-5-12 (T800UX4GC5); Seagate 500GB SATA2 7200 32mb cache HD; EVGA 8800GT 512MB Superclocked Edition
    Ultra X-connect X2 550-watt PSU; Vista x64 SP1 and OpenSUSE 11.0 (KDE 4.1)

  5. #5
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: Strange memory errors on GA-EP45-DS3P

    Yes, I would manually set timings, and ddr2 voltage to 2.1V. 2.2 would likely only be needed if you overclock the ram, and is the MAX allowed under warranty. Some ram will need the spec to run stated speeds, but not generally and 2.2 is hot, so I would try 2.1 first.

    1.9V may have only made things worse for a few reasons, Performance enhance was left on Turbo (Default) or your ram speed went up to 1066 which is would not be running at with only 1.8V so things likely just became all out of whack without all things being properly set

    And as said MCH needs 1.25-1.3 for 2x2GB to be stable.

    If you would like further help or suggestions please post back your full settings >>>

    This is Just a template I use to ask people their settings, pay no attention to the numbers in it, replace with yours

    MB Intelligent Tweaker(M.I.T.)
    Robust Graphics Booster ...............:
    CPU Clock Ratio ..........................:
    Fine CPU Clock Ratio.....................:.0
    CPU Frequency ...........................:


    Clock Chip Control
    Standard Clock Control
    CPU Host Clock Control..................: [Enabled]
    CPU Host Frequency (Mhz) ............: Mhz
    PCI Express Frequency (Mhz) .........:Set to 100


    Advanced Clock Control [Press Enter]
    CPU Clock Drive...........................: <<<
    PCI Express Clock Drive.................: <<<
    CPU Clock Skew (ps)....................: <<<
    MCH Clock Skew (ps)...................: <<<


    DRAM Performance Control
    Performance Enhance...................: [STANDARD]
    Extreme Memory Profile (X.M.P.).....: Disabled
    (G)MCH Frequency Latch...............: [Auto]
    System Memory Multiplier ..............:
    Memory Frequency (Mhz) ..............:
    DRAM Timing Selectable ................: [Manual]

    Standard Timing Control
    CAS Latency Time........................
    tRCD .........................................
    tRP'...........................................
    tRAS..........................................

    Advanced Timing Control
    tRRD...........................................
    tWTR..........................................
    tWR............................................
    tRFC...........................................
    tRTP...........................................
    Command Rate (CMD) ....................:2

    Channel A
    Static tRead Value.........................:7-10
    tRD Phase0 Adjustment...................:<<< Leave for all below as well
    tRD Phase1 Adjustment...................:Auto
    tRD Phase2 Adjustment .................:Auto
    tRD Phase3 Adjustment..................:Auto
    Trd2rd(Different Rank)....................:Auto
    Twr2wr(Different Rank)...................:Auto
    Twr2rd(Different Rank)...................:Auto
    Trd2wr(Same/Diff Rank)..................:Auto
    Dimm1 Clock Skew Control...............:Auto ps
    Dimm2 Clock Skew Control...............:Auto ps

    Channel B
    Static tRead Value.........................:7-10
    tRD Phase0 Adjustment...................:<<< Leave for all below as well
    tRD Phase1 Adjustment...................:Auto
    tRD Phase2 Adjustment .................:Auto
    tRD Phase3 Adjustment..................:Auto
    Trd2rd(Different Rank)....................:Auto
    Twr2wr(Different Rank)...................:Auto
    Twr2rd(Different Rank)...................:Auto
    Trd2wr(Same/Diff Rank)..................:Auto
    Dimm1 Clock Skew Control...............:Auto ps
    Dimm2 Clock Skew Control...............:Auto ps

    Motherboard Voltage Control
    Voltage Type.………... Manual
    CPU
    CPU Vcore….……….........................:
    CPU Termination…..... 1.200V*.......: <<< Leave
    CPU PLL…………………....1.500V*.......: <<< Leave
    CPU Referen.…………....0.755V*.......: <<< Leave
    CPU Reference2………,,0.800V*.......:<<< Leave

    MCH/ICH
    MCH Core…………….....1.100V...........: <<
    MCH Reference….…….0.800V...........; <<< Leave
    MCH/DRAM Ref.…......0.900V...........: <<< Leave
    ICH I/O……………….....1.550V............: <<< Leave
    ICH Core…………...……1.100V............: <<< Leave

    DRAM
    DRAM Voltage ……....1.800V............:
    DRAM Termination .…0.900V............: <<< Leave
    Channel A Reference 0.900V............: <<< Leave
    Channel B Reference 0.900V............: <<< Leave

    Advanced Settings
    Limit CPUID Max. to 3.....................: [Disabled]
    No-Execute Memory Protect............: [Enabled]
    CPU Enhanced Halt (C1E)................: [Disabled]
    C2/C2E State Support....................: [Disabled]
    x C4/C4E State Support..................: [Disabled]
    CPU Thermal Monitor 2(TM2) ...........: [Enabled]
    CPU EIST Function.........................: [Disabled]
    Virtualization Technology................: [Disabled]

  6. #6

    Default Re: Strange memory errors on GA-EP45-DS3P

    Quote Originally Posted by Lsdmeasap View Post
    Yes, I would manually set timings, and ddr2 voltage to 2.1V. 2.2 would likely only be needed if you overclock the ram, and is the MAX allowed under warranty. Some ram will need the spec to run stated speeds, but not generally and 2.2 is hot, so I would try 2.1 first.
    I tried that. It didn't help. However I tried turning down the RAM timings, and my computer seemed to be stable, which is why I didn't get back to this before. But now its acting up again. This intermittent nature is a real pig: if only it would just fail consistently I could get it figured out. :-/


    And as said MCH needs 1.25-1.3 for 2x2GB to be stable.
    I'll give that one a go. In the meantime, here are my settings.

    MB Intelligent Tweaker(M.I.T.)
    Robust Graphics Booster ...............: [Auto]
    CPU Clock Ratio ..........................: [9x]
    Fine CPU Clock Ratio.....................:. {not on my BIOS screen}
    CPU Frequency ...........................: 2.40GHz (266x9)


    Clock Chip Control
    Standard Clock Control
    CPU Host Clock Control..................: [Disabled]
    CPU Host Frequency (Mhz) ............: 266 Mhz
    PCI Express Frequency (Mhz) .........: [Auto]
    C.I.A.2 [Disabled]

    Advanced Clock Control [Press Enter]

    {I didn't check these, but I haven't touched them}


    DRAM Performance Control
    Performance Enhance...................: [Turbo]
    Extreme Memory Profile (X.M.P.).....: [Auto]
    (G)MCH Frequency Latch...............: [Auto]
    System Memory Multiplier ..............: [Auto]
    Memory Frequency (Mhz) ..............: 1066
    DRAM Timing Selectable ................: [Manual]

    Standard Timing Control
    CAS Latency Time........................ 5 [6]
    tRCD ......................................... 5 [6]
    tRP'........................................... 5 [6]
    tRAS..........................................15 [20]

    Advanced Timing Control
    {Again, I didn't check this, but I haven't touched it}

    Motherboard Voltage Control
    Voltage Type.………..
    CPU
    CPU Vcore….………........1.30000V: [Auto]
    CPU Termination…..... 1.200V*.......: [Auto]
    CPU PLL…………………....1.500V*.......: [Auto]
    CPU Referen.…………....0.760V*.......: [Auto]
    CPU Reference2………,,0.800V*.......:[Auto]

    MCH/ICH
    MCH Core…………….....1.100V...........: [Auto] {now increased to 1.24 as advised}
    MCH Reference….…….0.760V...........; [Auto]
    MCH/DRAM Ref.…......0.900V...........: [Auto]
    ICH I/O……………….....1.500V............: [Auto]
    ICH Core…………...……1.100V............: [Auto]

    DRAM
    DRAM Voltage ……....1.800V............: [Auto]
    DRAM Termination .…0.900V............: [Auto]
    Channel A Reference 0.900V............: [Auto]
    Channel B Reference 0.900V............: [Auto]

    Advanced Settings
    {I have neither checked nor fiddled with these}


    Finally, here are some numbers from Memtest86+ v2.01:

    MemMap e820-Std

    Failing addresses: 0007c0ffc84, 0007f1f689c, 7f9f689c, 0007fc9a89c, 0007fd9289c, 7fdf4a8c.

    The error bit patterns were 00001000, 00008000 and 00000800.

    Memory is running in interleaved mode, with 1GB in slot 1 and 1GB in slot 3. Are all these addresses from one slot? If so, which one?

    Thanks,

    Paul.

  7. #7
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    Default Re: Strange memory errors on GA-EP45-DS3P

    I would put the MCH value back to "Auto", change Performance Enhance to Standard and increment the DDR2 voltage by 0.1volts (so it at 1.9volts) as indicated on your PC health Bios Screen. Also set the main memory timings to 5-5-5-18 or 6-6-6-18

    Then run memtest,

    If it still fails, increment DDR2 voltage by 0.2volts (so its at 2.0volts)

    Then run memtest again.
    GA-P35C-DS3R Rev2.0 F11 bios, E8200 (@3.0Ghz), OCZ DDR3 PC3-10666 Reaper 4GB (@1200Mhz), Xonar D1, 8800GTS 512, Corsair HX520 (Single 12volt line, Max 40A), WDC 3200aaks/5000aaks in AHCI mode, Vista 64 Premium.

  8. #8
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: Strange memory errors on GA-EP45-DS3P

    The only way to know for sure about memtest is to test one stick at a time, and if it errors always in the same spot you have DOA/dying ram.

    Ya, I was going to say >>>
    DRAM Performance Control
    Performance Enhance...................: [Turbo] << Needs to be standard probably to run overclock to 1066 for your ram speed

    And you need to likely set the ram to spec or close, 1.9 is just not going to work at 1066 speeds. I would use 2.05 +/- or 2.1

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