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Thread: 295GTX ocp/ovp needed

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    \m/ (>.<) \m/ Dualist's Avatar
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    Default 295GTX ocp/ovp needed

    Got a two card 295GTX ref that needs either the ovp or the ocp doing.
    Everytime I hit 1.4v core or above it black screens as soon as I run a bench. Found no end of info on the single card but not the two card version.
    It has a VT1165MF controller if thats any help.
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    Pics...

    Master...



    Slave...



    Data sheet...
    http://www.4shared.com/document/ZYOO...REGULATOR.html
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    Friend of the family ARandomOWL's Avatar
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    Have you checked KPC? Mod should be similar to other cards with Volterra chip. If I have time to read through the datasheet I will give you a hand.
    Quote Originally Posted by K404 View Post
    Statistically, overclocking is 719% more fun than studying, even on a bad benching day.
    Quote Originally Posted by echelon101 View Post
    Putting 1.8v through a chip is like hitting someone with a baseball bat. Do it for a short time and the chip won't be hurt...do it for a long time and it will die.


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    I've search all through Tins threads and can't find anything, Sham did mention the 'sense' connectors but not what I do with them.
    So will see if Tin comes back and confuses the hell out of me
    Thanks mate.
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    Friend of the family ARandomOWL's Avatar
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    Quote Originally Posted by K404 View Post
    Statistically, overclocking is 719% more fun than studying, even on a bad benching day.
    Quote Originally Posted by echelon101 View Post
    Putting 1.8v through a chip is like hitting someone with a baseball bat. Do it for a short time and the chip won't be hurt...do it for a long time and it will die.


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    Quote Originally Posted by ARandomOWl View Post
    Yeah, thing is he shows the same card twice, the volterra's are rotated on the other card so don't totally trust him.
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    Quote Originally Posted by jimmyz View Post
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    Friend of the family ARandomOWL's Avatar
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    Trace the resistor back to the IC and find the same resistor on the other card. Chances are they use the same layout anyway.
    Quote Originally Posted by K404 View Post
    Statistically, overclocking is 719% more fun than studying, even on a bad benching day.
    Quote Originally Posted by echelon101 View Post
    Putting 1.8v through a chip is like hitting someone with a baseball bat. Do it for a short time and the chip won't be hurt...do it for a long time and it will die.


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    \m/ (>.<) \m/ Dualist's Avatar
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    Yeah if you spin my pics it's 180 out so all good.

    Anyhoo, I prodded about with my dmm and found that GND, Vnom- and Sense- are linked to the top of that resistor, I did worry as they are the other side of the IC not close to that resistor at all.
    And the bottom of the resistor is connected to R_SEL4.
    According to the data sheet Imax setting programmed by R_SEL4(A).



    But don't know what vr to put on there now, did some resistance tests and got this lot...
    @ 2000k I got... 311
    @ 200k I got... 48.8
    @ 20k I got... 7.43

    Any ideas.? Told you I was n00b.

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    Quote Originally Posted by Greed4Speed View Post
    Hope the new captains kick our asses and inspire us to get back into gear again, I volunteer to bend over first
    Quote Originally Posted by jimmyz View Post
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    Friend of the family ARandomOWL's Avatar
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    You need to refer to Table 1A/1B too. I don't have any experience with these chips so I'm not going to try and fudge some advice
    Quote Originally Posted by K404 View Post
    Statistically, overclocking is 719% more fun than studying, even on a bad benching day.
    Quote Originally Posted by echelon101 View Post
    Putting 1.8v through a chip is like hitting someone with a baseball bat. Do it for a short time and the chip won't be hurt...do it for a long time and it will die.


  10. #10
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    No problem mate, atleast you're honest

    Have done a little more reading as I found a mod section that didn't come up on google...
    http://www.ocxtreme.org/forumenus/showthread.php?t=4394

    Turns out Kingpin and Sham didn't do the ocp, they replaced some chokes according to Andre.

    But I can't do that, so as the Volterra is the same on the 285 I'm gonna attach the same 100k vr to that resistor and see if I can get a reading of 15k with them in parallel and go from there. Shouldn't be to bad as I'm getting 7.43k (?) to start with.
    http://www.xtremesystems.org/forums/...PU-and-OCP-mod

    Here goes nothing
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    Quote Originally Posted by Greed4Speed View Post
    Hope the new captains kick our asses and inspire us to get back into gear again, I volunteer to bend over first
    Quote Originally Posted by jimmyz View Post
    If stuff ain't dieing, you aren't trying.
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  11. #11
    Friend of the family ARandomOWL's Avatar
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    Quote Originally Posted by Dualist View Post
    No problem mate, atleast you're honest

    Have done a little more reading as I found a mod section that didn't come up on google...
    http://www.ocxtreme.org/forumenus/showthread.php?t=4394

    Turns out Kingpin and Sham didn't do the ocp, they replaced some chokes according to Andre.

    But I can't do that, so as the Volterra is the same on the 285 I'm gonna attach the same 100k vr to that resistor and see if I can get a reading of 15k with them in parallel and go from there. Shouldn't be to bad as I'm getting 7.43k (?) to start with.
    http://www.xtremesystems.org/forums/...PU-and-OCP-mod

    Here goes nothing
    When connecting two resistors in parallel, the net resistance is always smaller than the smallest resistor. ie. 100k and 7.43k in parallel: net resistance is less than 7.43k (actual value given by this equation).

    Another thing you have to remember is, when you're measuring resistances in-circuit, semiconductor devices and capacitors can interfere with the reading (your voltmeter produces a voltage across it's terminals in order to measure resistance). A reliable way to find the value of a resistor in-circuit is to read it's value code. Unfortunately, tiny SMD resistors aren't always labelled.
    Quote Originally Posted by K404 View Post
    Statistically, overclocking is 719% more fun than studying, even on a bad benching day.
    Quote Originally Posted by echelon101 View Post
    Putting 1.8v through a chip is like hitting someone with a baseball bat. Do it for a short time and the chip won't be hurt...do it for a long time and it will die.


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