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    Geforce go 7900gs volt modding - Fact or Fiction?

    Discussion in 'Gaming (Software and Graphics Cards)' started by mredison, May 9, 2007.

  1. mredison

    mredison Newbie

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    I thought I would open up a can of worms in a new thread, since the main 7900gs overclock thread is kind of big.

    Not familiar with the volt modding on the Go 7900gs? Check out

    http://forum.notebookreview.com/showthread.php?t=64385

    It seems to be mostly accepted that editing the labels in the VID table (Changing VID 7 label from 1.24 to 1.05) changes the actual voltage in the GPU, giving more stability. People are reporting lower temperatures this way.

    However, there have been a few naysayers. So I did an experiment:

    I created a v550c800.rom ('gsx') with the VID 7 label set to 1.0v and VID 3 set to .99v (Nibitor won't allow 3 and 7 to have the same label). 3D mode still uses VID 7.

    When I load this it works fine, exactly the same as 1.24v in fact. Same performance, same heat. Using the stock ROM, or setting VID 3 to 3D mode, causes tons of artifacts.

    This would seem to agree with the naysayers, and the Nibitor note that the VID table lablel is just that, the label. Really, it seems unlikely to me that the voltage would be 100% firmware adjustable like that. That would be a hell of a feature.

    Has anyone else tried this? I am tempted to set VID 7 to .1v and see what that does.

    Another interesting note is that the "GSX" roms on the Stormlifter site use VID 4 for 3D. Neither the stock GS or GTX reference this VID, so I would have the say the voltage is unknown, though it seems to work like VID 7. I have not used VID 4, have others found this to improve heat generation?

    What we really need is a table of the VIDs in the Geforce Go 7900gs. We know VID 3 = 1.0v, VID 7 = 1.24v, VID 4 = ? (maybe 1.24v?). To actually volt mod the go 7900gs to 1.05v, or something like that, we would need a VID with voltage between 1.0v and 1.24v. Do VID 0, 1, 2, 5, 6, 8+ exist?

    Unfortunately, I don't want to experiment radically on my card. Unless someone can find a design doc from nVidia, or a guinea pig wants to step up, we seem to be stuck with 1.0v or 1.24v.

    Comments? Done an experiment with VID labels that contradicts this? Am I totally off my rocker?

    mredison
     
    mredison, May 9, 2007
    #1