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Thread: P35-dq6 Problem With Mch Voltage> +0.2




  1. #1
    Join Date
    Oct 2007
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    Default P35-dq6 Problem With Mch Voltage> +0.2

    Hi

    I have the P35-DQ6 DDRII rev1 board and a Q6600 CPU. All the high quality components and impressive CPU PWM design + silent pipe makes it run super cool and ideal for quad core overclocking. So its a great board.


    But there is this annoying problem with GA P35-DQ6 when overclocking. Everytime the MCH voltage is set to > +0.2 (0.25 for example) usually after a reboot the PCIEX16 will electronically scale down to PCIEX1 as reported in CPU-Z/Everest and also visible by heavy decrease in graphics performance. I tried F4 / F5 and F6 bios. Restarting the system or shutting down/powering back up doesnt solve the problem.

    If you set the MCH voltage to +0.2 or lower it works fine and never falls back to PCIEX1.

    It has been confirmed by many GA P35-DQ6 owners that overclock their CPU including me.

    Is GIGABYTE aware of this problem? Do they have a plan to fix it?

    You can easily recreate the issue I described above.

    It works like a switch:

    MCH V > +0.2===> PCIEX16 falls back to PCIEX1
    MCH V =< +0.2 ===>PCIEX16 works fine.

    The problem is you may need more than +0.2V on MCH to have a stable overclock .


    To make things clear what I mean by the PCIEX16 slot is the upper most (closest to the CPU) PCIE slot.

    Thank you.
    Last edited by EreK; 10-25-2007 at 04:27 AM.

  2. #2
    Join Date
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    Default Re: P35-dq6 Problem With Mch Voltage> +0.2

    Hi EreK

    I guess maybe that is because you + too many mch voltage.
    sometimes when we over mch voltage, we also need to over PCI-E voltage to make it better, Could you try to over PCI-E voltage at the same time?

    Thank you

    Janus

  3. #3
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    Default Re: P35-dq6 Problem With Mch Voltage> +0.2

    Quote Originally Posted by GIGABYTE - Janus Yeh View Post
    Hi EreK

    I guess maybe that is because you + too many mch voltage.
    sometimes when we over mch voltage, we also need to over PCI-E voltage to make it better, Could you try to over PCI-E voltage at the same time?

    Thank you

    Janus
    Thank you for the reply.

    Good point Janus.

    Yes I tried setting PCIE voltage to +0.2 and +0.25. Also I tried setting the PCIE bus frequency from 100 to 120. You may get one lucky system boot to windows with PCIEX16 but after a reboot it jumps back to PCIEX1.

    Here is all the voltage settings I use:

    417x9


    PCIE Freq:105-120
    Vcore:1.5875
    PCIE Voltage: +0.2
    VDIMM: +0.35
    FSB Voltage: +0.35
    MCH Voltage: +0.2 (works good) MCH Voltage: +0.3 (PCIEX1 problem)
    Last edited by EreK; 10-25-2007 at 02:57 PM.

  4. #4
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    Default Re: P35-dq6 Problem With Mch Voltage> +0.2

    Dear EreK

    I talked this with our RD, yes this will have this issue in p35 chipset MCH Voltage limited .
    sometimes when over MCH Voltage: more than 0.2v, your system can even search no VGA card. we suggest you can just +0.2v for overclock. if you want overclock more, you can over Voltage for cpu, ram..., it will be better.

  5. #5
    Join Date
    Oct 2007
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    Default Re: P35-dq6 Problem With Mch Voltage> +0.2

    Thanks for the explanation Janus.

    So it's an Intel P35 chipset limitation. Unfortunately I found out that my overclock is not stable with MCH at +0.2. I need more than that to run my CPU at 417x9 fully stable. So I guess I have to move on to an X38 mainboard.

    Thanks again for taking time and getting the information from gigabyte RD team.

    Regards,
    Last edited by EreK; 10-30-2007 at 03:44 PM.

  6. #6
    Join Date
    Oct 2007
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    8

    Default Re: P35-dq6 Problem With Mch Voltage> +0.2

    Could you try to set your PCI-E Frequency at 101 or 110Mhz with MCH at +0.3 ? It seems to be the solution to this problem according to other forums...

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