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Thread: ATI 3850/3870 Voltmod thread

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  1. #1
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    Quote Originally Posted by Factotum View Post
    voltmod made HIS3870ICeQ3
    After a couple of seconds in 3D-mode, voltage chip falls from 1.46 to 1.15 V
    What's wrong?
    OCP on the HIS, once you raise the vgpu past 1.4v OCP kicks in and drops the voltage to 1.15v when you run 3D. I think that is what those extra couple resistors are doing when you compare to reference.

    One thing you can try tho is a different BIOS. GeCube and Sapphire BIOS supposedly allow for more than 1.4v but I havent tried em personally. I always get the dam checksum error and am not sure how to change that.
    Last edited by Eldonko; 05-20-2008 at 12:26 PM.
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  2. #2
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    Quote Originally Posted by Eldonko View Post
    OCP
    Sorry, but what's this? The hard-lock...? If true, how to get rid?

  3. #3
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    Quote Originally Posted by Factotum View Post
    Sorry, but what's this? The hard-lock...? If true, how to get rid?
    Over current protection. The card kicks back to 1.15v if a certain voltage threshold is passed.

    According to shamino's pic, the resistors are here:



    But I would try a different BIOS before doing this..
    Last edited by Eldonko; 05-21-2008 at 07:43 AM.
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  4. #4
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    Quote Originally Posted by Eldonko View Post
    Over current protection. The card kicks back to 1.15v if a certain voltage threshold is passed.
    According to shamino's pic, the resistors are here:
    I'm do it tomorrow evening
    Last edited by Factotum; 05-21-2008 at 08:01 AM.

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