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Thread: Overclocking nVidia and Folding

  1. #1
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    Default Overclocking nVidia and Folding

    This is The method I used for finding the ceiling at which my cards will fold......

    Normally you want to shoot for the highest possible stable clocks for your card for core, shader, and memory if you want the most bang for your buck. But not just any clock increase will show improvement. First, unlink the core and shaders so you can maximize both. Try to max each singly to get an idea of the limits you will be reaching.


    Use Rivatuner hardware monitoring to monitor your clocks in real-time. This has the benefit of showing you that your nVidia card will increase your clock speeds in steps. For example, shader clocks increase in 54MHz steps only and nothing in between. For example, it goes from 1674 to 1728 to 1782, nothing in between. No matter what MHz you set it at in that range, it'll only be one of those numbers. When you get close enough to the next, it'll switch, and you can SEE this in Rivatuner monitor.

    The same is true for core and memory, although the steps are smaller.
    Have a look, and you'll see what I mean.

    When overclocking for the purposes of folding then Shaders is king so this is where we will start.

    Winding the core down to 600 with the shaders linked gives a starting point

    core core shader shader mem 1% 1% 1% 1% 1% 1% Fahmon
    set actual set actual ppm
    601 1545 999 1m26
    601 1626 1620 999 1m24
    601 1641 1620 999 1m24
    601 1655 1674 999
    601 1700 1674 999
    601 1707 1728 999
    601 1766 1782 999
    601 1811 1836 999
    601 1869 1890 999
    601 1920 1944 999 1m14 1m13 1m14 1m14 1m14 1m13 5681
    624 1920 1944 999 1m13 1m13 1m13 1m13 1m13 1m13 5681
    642 648 1920 1944 999 1m13 1m13 1m13 1m13 1m13 1m12 5681
    660 663 1920 1944 999 1m13 1m13 1m13 1m13 1m13 1m12 5681
    680 676 1920 1944 999 1m12 1m12 1m13 1m12 1m12 1m13 5760
    701 702 1920 1944 999 1m12 1m13 1m12 1m12 1m12 1m12 5760
    722 720 1920 1944 999 1m11 1m12 1m12 1m12 1m12 1m12 5760
    740 738 1920 1944 999 1m12 1m11 1m12 1m12 1m11 1m12 5760
    750 756 1920 1944 999 1m12 1m11 1m12 1m12 1m11 1m11 5841
    766 771 1920 1944 999 1m11 1m12 1m12 1m11 1m11 1m11 5841
    775 777 1920 1944 999 1m11 1m11 1m11 1m11 1m12 1m11 5841
    781 783 1920 1944 999 1m11 1m11 1m11 1m11 1m11 1m12 5841
    784 783 1920 1944 999 1m11 1m11 1m11 1m11 1m12 1m11 5841
    787 786 1920 1944 999 1m11 1m11 1m11 1m11 1m12 1m11 5841
    790 792 1920 1944 999 1m11 1m11 1m12 1m11 1m11 1m11 5841
    790 792 1920 1944 1053 1m11 1m11 1m10 1m11 1m11 1m10 5924
    790 792 1920 1944 1107 1m10 1m10 1m10 1m10 1m10 1m10 5924

    The working area is denoted in yellow

    Setting core shader and memory to 601,1545,999 gives a time for 1% of 1min 26 seconds

    Next selecting shaders and setting to 1626 produces an actual setting of 1620…changing the setting to 1641 does NOT actually change the setting it is still 1620.

    Setting 1655 however means that the actual setting snaps to 1674 and again increasing the shaders to 1700 (increase is <54) the actual setting remains at 1674

    Adding a further 7 making the new setting 1707 (>54) the actual speed snaps to 1728 (54> 1674)

    Continuing down the shader set column increases of not less than54 make the actual setting increase in steps of 54

    For this particular card increases above 1944 cause Folding to fail

    Next Adjustments to Core

    With the core set to 601 the columns show the time taken to complete each percent and Fahmon’s reported ppd of 5681 these are where the differences are seen when increasing core speed.

    Again we can see that setting the core speed produces an actual core speed that can be either higher or lower as the setting snaps to the nearest fixed amount.

    Again for this particular card going above 792 causes Fah to fail.

    Finally; Memory settings

    There is not a great increase to be had from increasing memory clocks it is however possible to eke a little more performance from your card as can be seen from the results in the table (again in yellow)

    So guys I hope this is useful or saves time and gets you to where you want to be when you overclock your CPU
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    very cool. I did something similar today while overclocking my 4850 using F@H to benchmark.

    I used RivaTuner for setting my overclock, also maxing the fan-speed at 100% ,and used GPU-Z to monitor temperatures.
    folded for approximately 10 minutes at every tier and recorded the best result. times were always within a second threshold of each-other. When I reached 745MHz I decided to fold for 45 minutes while I went for a shower

    here are my results

    (I couldn't paste the chart in so here's a picture)


    I had the same experience where a memory speed increase yielded unseen results so focused on the core clocks instead. I started recording Core temperature after 700MHz . The hottest the shader core got was 75C @700MHz core, and 78C @ 745MHz core.

    120 MHz gain shaved 20s off a 1% WU , 33m 20s off a full WU.

    19% overclock with a 16% time reduction very nice

    first holdup was at 760MHz. temps seemed to be alright but the F@H client refused to fold receiving a Unstable Machine, Core Shutdown message in the prompt.

    and another holdup at 750MHz, immediately the GPU crashed, windows recovered but unfortunately left me with a blank screen and had to manual reboot. I received the same types of crashes when determining gaming stability. crash would start with 1 beep followed by 5 seconds of audio and video freeze. afterward video signal is lost to the screen while all audio and peripherals would recover and continue normally.

    and that concludes today's overclocking experience

  3. #3
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    Thanks for your efforts Ape, Info about ati is thin on the ground here.

    If Nvidia is anything to go by 730 or even 715 would be the max for 24/7 folding without problems...sort of a set and forget number.
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    Just beginning to learn how to do this...


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    Dare I ask who you're folding for?

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    Quote Originally Posted by Skyguy View Post
    Dare I ask who you're folding for?
    I started with TPU during the ChimpChallenge...heck of a way to learn haha.

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    Once you have it all figured out rick, maybe you would like to try to get things running again here?

    I only ever did GPU folding and found it a) expensive on elec and hardware and b) time consuming keeping it running and with all the updates.

    Let us know if you would like to take the reins .
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  8. The following user thanks grumpydaddy For this above post:

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    Thanks for the vote of confidence Grumpy, but I am far too new at this to think of mentoring anyone lol. I figured with all the time I have wasted overclocking hardware over the years for no tangible gain, this would be a way to give back in some small way.

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    Like to have never figured out how to get these GTX 460's to play nice. It ended up taking a driver swap (266.58).


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    Good Job!!

    2600K needs work though
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    Working with a crippled cpu/mb or maybe a combination of both. May try to bump it up soon for effect.

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