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Thread: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks




  1. #21
    Lsdmeasap's Avatar
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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    Keep PCH under 1.2, shouldn't even need that.

    I need to know what ICH voltages you have access to before I could comment on that one

  2. #22
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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    Under the MCH/ICH section of my BIOS (P55m-UD2 @ f10 bios) the only two options are 'PCH core' and 'CPU PLL'

    PCH core says 1.050v, next step up is 1.100v and then 0.02v increments from there up
    CPU PLL is 1.8v, with the next step up being 1.86v and then 0.02v increments from there up

  3. #23
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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    Try 1.1-1.15 PCH

    CPU Pll shouldn't affect this, but you can try 1.86

    So no ICH core or ICH I/O then? That sucks, this is what I really wanted you to test

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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    Nope, not unless its one of the 'hidden' ctrl-f1 options (didn't think to check those)

  5. #25
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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    Try it out, but now that I look at your model again I doubt it, normally the boards lesser than UD3/DS3 have limited options so I expect your BIOS wont have this option.

    It could be the memory causing this though, can you test with a single stick and see if that makes any difference, and test with different memory if you can to see if that matters or not.

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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    Nope, no secret voltage options on this board, just the usual near-useless legacy options they always hide

    There was no change to the freezing issue when I swapped in the 2x2GB kit from my older P55-UD3R build last week (G.skill Ripjaws, F3-12800CL7D-4GBRM rated @ 1600mhz 7-8-7-24 @ 1.6v)
    I used the same RAM settings as the other sticks (1.5v, 1333mhz, 9-9-9-24)

    I have yet to try the board with only 1 stick, will try that next, after I try 1.12v PCH & 1.86v CPU PLL

  7. #27
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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    The issue still remains when set at 1.12v PCH & 1.86v CPU PLL, with the GTS 250 installed and freezing within 1-5min of boot +60% of the time (or staying up 5-10min and then freezing after i click restart, during the shutdown processes)

    My... hunches as to why it freezes sooner with the GTS 250 are that its something to do with the GTS 250's "green" or energy saving features/PCB changes that is causing the system to freeze more often than with the 1st gen 9800GTX+/9600GSO 512 (G92) which both lack such fancy variable voltage/clocks/etc... and/or possibly to do with the power being pulled via PCI-E slot, since the 9800GTX+ has the pair of 6pin PCI-E power connectors direct from the PSU to draw from instead of just one. But... just hunches, and since the system does freeze regardless of card, ones that don't lead me to any obvious test/solution :/

    Next up I try with a single stick of RAM....

    Jeez, I swear I've put at least a years worth of resets on this machine in the past 3weeks :/

  8. #28
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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    It may just be those cards do not work well with the current BIOSes, can you test an ATI card?

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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    ya, I'll try an ATI 4850 shortly and see what happens, but the build kinda needs to run a nvidia card when I'm done with it

    At this point I'm thinking I should RMA the motherboard, since I've already swapped out everything except the CPU without eliminating the freezing

  10. #30
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    Default Re: P55M-UD2, i5-750 & F3-12800CL9D-4GBNQ unstable at stock clocks

    Cool, ya I just wanted to test and see if that mattered is all.

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