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Gigabyte 8600GTS vmod ?

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  • Gigabyte 8600GTS vmod ?

    The back of the Gigabyte Silent Air 8600GTS only has two chips that could be PWM Controllers, a 74ACT08 (printing is too small, looks like an F, maybe Fairchild )
    & a NEXSEM NX2114. This 2nd one I think is the Vmem (I've got a 50/50 chance anyway) Assuming it is, the pin highlighted in green, is the FB pin #6.
    The dot in the red eclipse closest to it has no resistance to the #6 leg, the other has no resistance to ground. So a pencil mod here should raise the Vmem.

    I got this diagram from the NEXSEM website. But if #6 is the FB undervoltage protection,
    Shouldn't I get some resistance to earth?
    It reads an open circuit.

    2nd problem: Where do I read the Vmem?
    There is nothing on the top of the board that looks like an inductor.

  • #2
    Here is a link to some 8600GTS mods on VRzone. They aren't on a Gigabyte card, but probably the same or close enough to maybe help you out.


    • #3
      Thanks Boshuter, but those cards have completely different componants than the passive cooled models.
      Not the least, mine has no additional power lead, & gets all it's power from the PCI-E slot. So I wouldn't be able to run those sort of voltages anyway.


      • #4
        Well I think I have the Vmem worked out. The spot in the pink square is the easyist of 5 places to read what I think is the Vmem.
        It read 2.083v which seemed a bit high for stock, but nowhere else came close.
        A couple of spots read 1.435v, so I assume that's the read point for the Vgpu.
        I took out my trusty HB & penciled a bit on the resistor in the red eclipse. It raised the voltage in the pink square to 2.156v.
        I need to change the Silent Air cooling & put some ram sinks on the memory to really test it out,
        but I was able to get through the trolls in 03 with an extra 30mhz. So I think I'm on the right track.


        • #5
          Good job John......

          That memory voltgage sounds right, I think on that other card I linked to the default mem voltage was 2.0-2.1v. I've had mixed results with raising mem v on gpu's, biggest gains always came from vgpu for me.