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Thread: GA-P31-DS3L PCIE freq question




  1. #1
    Join Date
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    Default GA-P31-DS3L PCIE freq question

    Hi,
    I just need a clarification on the PCIE frequency when overclocking a P31 mobo.

    I've been experimenting with my PC for a while now and I learned that I have to increase the PCIE freq when I go over 333Mhz FSB. I've found this equation somewhere on the net:

    FSB / 3.33 = PCIE

    I pushed my E7200 up to 3.80ghz (400x9.5) the other day and to achieve it I had to either set the PCIE to 118mhz (which is dangerously high) or leave it at AUTO. My PC wouldn't POST otherwise.

    Now, the manual for my mobo says that the PCIE freq will be locked to 100mhz when set to AUTO in the BIOS. I can't read it from Windows though, as EasyTune5Pro leaves blank space under PCIE/AGP, I also tried ClockGen with no success...

    My question is: what's happening to that darned PCIE when set to AUTO? Is it locked to 100mhz or not?
    E7200 @ 3.16 (9.5x333) / GA-P31-DS3L / 2 x 2gb DDR2 800 / ATI 4850 512mb / X-Fi Platinum

  2. #2
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    Default Re: GA-P31-DS3L PCIE freq question

    Yes it does stay on 100mhz. If ur not certain just manually set it to 100mhz.

    Ive never heard of such an equation :S. It has to be fake.
    Asrock P55-Extreme
    Core I5 @ 3.2GHZ
    2x2GB G.skill Ripjaws DDR3 1600
    ASUS HD5850
    1TB Samsung SATA II
    Corsair TX650W PSU

  3. #3
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    Default Re: GA-P31-DS3L PCIE freq question

    If ur not certain just manually set it to 100mhz.
    You didn't understand my post, my friend - my English is not perfect, so please, bear with me.

    My computer won't POST with the PCIE locked at 100mhz when the FSB is set above 340mhz... It would simply reboot after hitting F10 (save to CMOS and exit) with all the BIOS settings reverted to the default values.
    And that's when the equation comes into play. For instance, the lowest PCIE frequency my mobo accepts is:

    FSB / PCIE
    360 / 106
    370 / 109
    380 / 112
    390 / 115
    400 / 118

    The equation is actually quite accurate, it applies to Gigabyte's P31 and probably G31 motherboards. I've done a lot of research on that, I'm not the only one who has this problem.

    I'm trying to establish what happens when I set the FSB to let's say 400mhz and leave the PCIE at AUTO. I don't want to risk damaging my GPU.
    E7200 @ 3.16 (9.5x333) / GA-P31-DS3L / 2 x 2gb DDR2 800 / ATI 4850 512mb / X-Fi Platinum

  4. #4
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    Default Re: GA-P31-DS3L PCIE freq question

    bump
    E7200 @ 3.16 (9.5x333) / GA-P31-DS3L / 2 x 2gb DDR2 800 / ATI 4850 512mb / X-Fi Platinum

  5. #5
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: GA-P31-DS3L PCIE freq question

    Budget boards such as P31 or P43 will need PCIE set to above 100 for overclocking generally. Auto is not advised because when you raise the FSB the PCIE Freq will also increase automatically.

    I suggest 100-110 as a safe range, but anything above 100 can damage your board/GFX Cards, and Hard drives. So it is all up to you, but manually set it for sure.

    If you want to run 400 FSB, and have to use 118 I do not suggest that or you will damage something for sure. I suggest a new board, P35 if you do not have much money, or P45-UD3x models are all around $90-120

  6. #6
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    Default Re: GA-P31-DS3L PCIE freq question

    That's the info I was looking for.

    Many thanks for your reply, Lsdmeasap.
    E7200 @ 3.16 (9.5x333) / GA-P31-DS3L / 2 x 2gb DDR2 800 / ATI 4850 512mb / X-Fi Platinum

  7. #7
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: GA-P31-DS3L PCIE freq question

    Good luck with your venture!

    Sounds to me like you need a better board really if you want to push your CPU as high as you are doing now.

    If you need anymore help with anything let us know and we will try our best to advise

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