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Thread: OC problem with DDR3 in EP45T-UD3P




  1. #11
    Chike is offline Senior Member
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    Default Re: OC problem with DDR3 in EP45T-UD3P

    This just to see what values actually applied since all voltages are on auto. PLL looks too high. More DRAM Voltage, up to it's spec, could also help with all this ram.

    What is the default VID of the CPU?

  2. #12
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    Default Re: OC problem with DDR3 in EP45T-UD3P

    CPU default is 1.35v, but if I use that MB made it so low it crashes. By now real monitor say Core Voltage=1.328v at iddle, although BIOS setting is 1.375000v.


    In fact this MB is a little strange in that, my previous P35-dq6 were pretty much volt stable, but with this P45 even without OC if I simply put all volts to "normal" (as I read before in some OC manual because auto setting overvolts) PC fails to start with a "MB fail" warning (continous short beep), it's anoying.

    Will try that and see, I was making stress bench with rised MCH as Lsdmeasap sugest, but it crashes even sooner with that.

    S!

  3. #13
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    Default Re: OC problem with DDR3 in EP45T-UD3P

    Ok, think I did it rising DRAM voltage, now settings are this...

    CPU
    CPU Vcore….……….........................: 1.375000v
    CPU Termination…..... 1.200V*.......: (auto)
    CPU PLL…………………....1.500V*.......: (auto)
    CPU Referen.…………....0.755V*.......: 0.760 (auto)

    MCH Core…………….....1.100V...........: 1.220v<<<
    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 ……....1.500V............: 1.7600v<<<
    DRAM Termination .…0.750V............: (auto)
    Channel A Reference 0.750V............: (auto)
    Channel B Reference 0.750V............: (auto)

    And that says Easy Tunes...




    It works fine now and have no error in stress test. I think right now I should fine tune it, isn't it? What voltages should I try to lower and/or hand select? And, if now I try to lower latencies, should reset any mem voltage? Thank you guys.

    S!

  4. #14
    Chike is offline Senior Member
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    Default Re: OC problem with DDR3 in EP45T-UD3P

    The voltage drop is normal, there is always a difference between BIOS settings, idle and lowd voltage unles you use Load Line Calibration, and it was taken into account when intel set VID to it's default..

    It is true that auto does overvolt sometimes, but rather than normal, voltages need to be set manually, initially to their default valu to the left, and then adjusted as needed. Reference voltages can be left on auto, but may also need to be set manually for extreme OC.

    I am no expert but PLL seems very high.
    Since you say it is memory stress that fail, and you have a lot of memory, increasing MCH Core, one increment at a time up to 1.32v may help stability. A higher DRAM Voltage may help too.

    Please fill your signature with your hardware specs, including a link to your ram specs or at least part number, it make easier to follow.

  5. #15
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    Default Re: OC problem with DDR3 in EP45T-UD3P

    Yes, may be normal Vdrop, but so different? Also I know every MB is different, but in my previous P35-DQ6 I simply rise FSB for processor and set all volt to "normal" for preventing overvolt, and works OK!! Dont know why I have to teawk a lot of values right now for the same OC, that is a very common one, nothing extreme.

    Well, right now it's stable with the setting above, think I should try to lower and hand select some volt for fine tuning, but what of them and wich order I should try?

    S!
    Intel E6600 2.4GHz @3.3GHz FSB 1464MHz
    Gigabyte EP45T-UD3P rev. 1.0 BIOS F8c
    4x2Gb ocz3n1800sr4gk 1800MHz 8-8-8-27 1.9v
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  6. #16
    Chike is offline Senior Member
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    Default Re: OC problem with DDR3 in EP45T-UD3P

    Start with CPU PLL, I am not sure what safe value is for this parameter but 1.75v seems way too much.
    Set it 1.65v or lower untill someone that know more about it help you with it.

  7. #17
    Acebmxer's Avatar
    Acebmxer is offline Gigabyte Elite
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    Default Re: OC problem with DDR3 in EP45T-UD3P

    Max safe voltages that I know of are

    CPU PLL 1.63-1.65
    VTT 1.4 (CPU Termination)
    MCH 1.4

    Try setting CPU PLL to 1.57, Take note of your current VTT set to 1.2 and then change Mch ref from defualt .076 up one notch then set VTT back to where it was. CPU ref and Mch ref scale with VTT. Also set VTT to 1.2 before adjusting CPU and Mch ref. Then try Mch 1.24-1.26
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  8. #18
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    Default Re: OC problem with DDR3 in EP45T-UD3P

    Wow, too many things at a time :) .

    Yesterday night it was working all fine and OK. Today in the morning it doesn't start... beep a MB fail and return to default values... wanna kill it...

    I lower by hand PLL to 1.65v and seems OK, but I don't believe nothing now until I see it working fine all the time. I continue testing. Please can you explain that a little bit more?

    S!
    Intel E6600 2.4GHz @3.3GHz FSB 1464MHz
    Gigabyte EP45T-UD3P rev. 1.0 BIOS F8c
    4x2Gb ocz3n1800sr4gk 1800MHz 8-8-8-27 1.9v
    OCZ Technology | Products | Memory | OCZ PC3-14400 NVIDIA SLI-Ready Edition

  9. #19
    Lsdmeasap's Avatar
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    Default Re: OC problem with DDR3 in EP45T-UD3P

    For 45nm CPU I would keep PLL under 1.6, and at only 3.3Ghz you should not need anymore that stock 1.5 really

  10. #20
    Chike is offline Senior Member
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    Default Re: OC problem with DDR3 in EP45T-UD3P

    Quote Originally Posted by Lsdmeasap View Post
    For 45nm CPU I would keep PLL under 1.6, and at only 3.3Ghz you should not need anymore that stock 1.5 really
    The E6600 is 65nm, what safe limites for them?

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