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Thread: 4x1 GB @1200MHz not work at EX38-DQ6




  1. #21
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    Default Re: 4x1 GB @1200MHz not work at EX38-DQ6

    Hello everybody,
    First thank you a lot, your comments and ideas, changed mine view to hardware for last users. I was supprised when i noticed that your knowledge about motherboards and techonology...
    Nickel020 is right that in spite of my week-end tryings for overclocking i was not succeed to make stable 4x1 GB on my board by trying all voltages which i learned from your answers from this forum..But i succeed to run stable,
    4x1 GB @1066 @2,12V MHz 5-5-5-15 timings,
    3x1 GB@1200MHz @2,37V 5-5-5-15 timings,
    4x1 GB@800MHz @2,32V 3-3-3-8-18 timings,
    and also there is no problem to tun 2X1 GB@1200MHz with System Memory Multiplier:3,00A @ 400MHzx9 : 3600MHz
    And i run 3Dmark'06 (different settings from defaults,
    resolution:1680x1050 , AA:4X , anistropic:8X)
    and everest with all these stable speeds.
    And here is the results from 3Dmark'06....
    400x9:3600MHz - 2x1 GB@1200MHz = 14136
    400x9:3600MHz - 3x1 GB@1200MHz = 12826
    400x9:3600MHz - 4x1 GB@1066MHz = 11130
    400x9:3600MHz - 4x1 GB@800MHz(3-3-3-8-18) = 11126
    400x9:3600MHz - 4x1 GB@800MHz(5-5-5-15) = 10090
    Although use test settings which need more ram 2X1 GB@1200MHz won the race...
    But in my opinion, Gigabyte had to be write "4 Dimms does not support 1200MHz" at QVL. I found a article from bit-techs "secret of the PC memory" and in this article, there is scientific approach to use of 4 Dimms at higer speeds.

    "Clock Skew in Synchronous Memory
    When an increasing number of circuits are synchronised to a clock, a clock delay phenomena can happen. As a result, all the data
    has trouble associating with the right clock and turning up on time: this phenomenon is commonly known as Clock Skew.
    Clock Skew can be caused by many factors including extended path, temperature fluctuation, adding multiple logic circuits along
    that line, material imperfections and fundamental design flaws on the motherboard – in other words, it can happen in many different
    parts of the memory system. De-skewing logics at different locations will try to minimise the negative effects in order to maintain a
    coherent relationship between the Data and the System Clock. However, as the memory performs at an ever increasing rate, not
    all problems can be resolved easily.
    Enthusiasts may be more familiar with the appropriately named “Clock Skew” variable in the motherboard BIOS, where it can be
    used to attain higher level of stability when overclocking the computer memory in order to resolve Clock Skew between DIMMs.
    Inevitably, the faster the memory performs, the greater the probability of Clock Skew.
    The Clock Skew can be more profound when using four memory modules instead of two in your motherboard and the skew
    amount depends on which two slots are being used at any one time, and the fundamental design of the PCB.
    Motherboards that have gone through extensive design simulation and testing phase to attain a particularly high quality tend to
    manage Clock Skew issues fairly well. However, due to extremely competitive market pressure and falling product shelf-lives,
    many deficient motherboards are launched prematurely and hyped without having sufficient testing time, then later patched as
    much as possible in BIOS updates. Increasingly complex motherboard chipsets and higher memory speed are adding more
    opportunity of failures in this respect."


    According to you; masters! Can 4x1 GB run @1200MHz by adjusting the "Clock Skew" settings of the rams!
    Thanks a lot for your answers...

  2. #22
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: 4x1 GB @1200MHz not work at EX38-DQ6

    So did you test out any MCH Skew or Per channel Memory Skews with all 4 sticks yet?

  3. #23
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    Default Re: 4x1 GB @1200MHz not work at EX38-DQ6

    Dear Lsdmeasap,
    As ı tryed to explain at my 3. reply i have not got any info about clock skew. Yes i read this article but what are that:50ps~750ps ... what is the opening out of ps. What will be difference between 50 and 750? These are the questions in my brain now. But i will be pleasure if you could give me some suggestion to with which setting i must start or i must try at beginning...From 50ps to 750ps or 750ps to 50ps....
    Last edited by tekkenking; 02-23-2009 at 06:32 PM.

  4. #24
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    Default Re: 4x1 GB @1200MHz not work at EX38-DQ6

    I would try out 50-250 MCH Skew, they are usually not needed until after 500+ FSB, but they may help you with 4x1 @1200

    Do not worry, this setting cannot harm your board, it will only help or not work, or do nothing you can notice. It is not a voltage or anything so no need to worry if you use to much or anything like that

  5. #25
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    Default Re: 4x1 GB @1200MHz not work at EX38-DQ6

    Thanks a lot Lsdmeasap,
    I am going to try it this evening. One question for you. At your first reply you wrote that;
    Here is your capacity info >>>
    Quote:
    1. 4 x 1.8V DDR2 DIMM sockets supporting up to 8 GB of system memory
    2. Dual channel memory architecture
    3. Support for DDR2 1200/1066/800/667MHz, ECC, non ECC memory modules.

    * Please refer "Memory Support List" for memory support information.


    For 4x1GB i need 4x2,35V but boards can give 4x1,8V. I know that i can adjust until 3,3V but i think it is only for 2 dimms. For utilisation 4 dimm voltage decrease to 1,8V per channel.
    I will write you the result tomorrow..
    Good days..

  6. #26
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    Default Re: 4x1 GB @1200MHz not work at EX38-DQ6

    You can increase the RAM voltage no matter how many DIMMs you're using. The actual output voltage at a give setting mmay not be exactly the same as with only 2 DIMMs, but you can still increase it.


  7. #27
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: 4x1 GB @1200MHz not work at EX38-DQ6

    ^^ Right ^^^

    That spec you quoted only means the board supports 4 x 1.8V sticks, as a standard. Like it means it supports DDR2 standard which is 1.8V, you can use any voltage you want, and sticks of most any voltage

    Some more reading on skews for ya >>>
    How to: Clock Skew Can Save Your Overclock And Memory - Overclock.net - Overclocking.net

  8. #28
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    Default Re: 4x1 GB @1200MHz not work at EX38-DQ6

    Hello everybody,
    I achieved only one time to open the windows with the settings below at 4x1 GB..But it was not stable. (Meanwhile my CPU is G0 version)


    MB Intelligent Tweaker (MIT)
    Robust Graphics Booster: Turbo
    CPU Clock Ratio: 9x
    CPU Host Clock Control: Enabled
    CPU Host Frequency(Mhz): 450
    PCI Express Frequency (Mhz): 105
    C.I.A.2: Disabled
    Performance Enhance: Extreme
    System Memory Multiplier: 2,66D
    Memory Frequency(Mhz): 1200
    DRAM Timing Selectable: manual

    Standard Timing Control
    CAS Latency Time:: 5
    DRAM RAS# to CAS#: 5
    DRAM RAS# Precharge: 5
    Precharge Delay(tRAS): 15

    Advanced Timing Control
    ACT to ACT Delay(tRRD): Auto
    Rank Write to READ Delay: Auto
    Write To Precharge Delay: Auto
    Refresh to ACT Delay: Auto
    Read To Precharge Delay: Auto
    tRD : Auto
    tRD Phase Adjustment : Auto
    Command to #CS Timing: 2T

    Clock Driving and Skew Control
    CPU/PCIEX Clock Driving Control : 1000
    CPU Clock Skew Control : 50ps
    (G)MCH Clock Skew Control : 150ps

    System Voltage Control
    DDR2 OverVoltage Control : 0.50
    PCI-E OverVoltage Control : 0.20
    FSB OverVoltage Control : 0.20
    (G)MCH OverVoltage Control : 0.350
    CPU Voltage Control :1.5325
    Normal CPU Vcore : 1.275<!-- / message -->

  9. #29
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: 4x1 GB @1200MHz not work at EX38-DQ6

    Robust Graphics Booster: Fast

    Performance Enhance: Standard

    ^^ those will get you further ^^

    And I have to say, all those Auto's are likely a part of your instability as well.

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