nvidia ic undervoltage

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  • ktmmotocross
    Boardkiller
    • Feb 2014
    • 3553
    • slovakia
    #1

    nvidia ic undervoltage

    everybody know that voltage regulator for nvidia ic can be hw modded. unique release even calculator for that.
    i look in my bios folder and found NiBiTor for modding nvidia bios and it have even frequency and voltage modding feature. do u think that it can be used to undervoltage nvidia ic without hw regulator modding?
    Tags: None
    • Th3_uN1Qu3
      Believe in
      • Jul 2010
      • 6031
      • Romania
      #2
      Re: nvidia ic undervoltage

      BIOS mods can only be used when there is hardware support for it. You have to check the schematic. I have successfully used this on a gaming laptop i have recently bought (oh yeah, i have to remember to actually post about it). This one was actually in the other direction - the chip is fine and doesn't have a problem with heat, but it became unstable in "power saver" mode due to core voltage being too low in that state. So i set all states to use the 3D mode voltage of 1.0v, and the laptop has been running great since.

      However, there are many boards that will only show you different voltages in the different performance states of the chip - in hardware, the voltage really stays at the same level all the time.

      Also, most nvidia chips can go lower in 3D mode than even the "low" level that is factory set. There will be at most two voltage values, one "low" and one "high". There are some boards which have digital VRMs, but you will find that even for those, the values are hardcoded either in the BIOS or the EC, and there is no obvious way to change them (i've tried). And the nvidias need all the help they can get to live a long life. So while a BIOS-level modification is possible on some boards, it is no match for a hardware mod.

      Besides, BIOS modding on laptops is quite tough. You have to first get (or dump from the machine) a clean ROM file. Then you need a way to extract the video BIOS module from it, edit it, then put it back in there without messing anything else. There are plenty of tools for Phoenix BIOS, but others like Dell or Insyde, not so much.
      Last edited by Th3_uN1Qu3; 12-17-2014, 05:12 AM.
      Originally posted by PeteS in CA
      Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
      A working TV? How boring!

        Comment

        • ktmmotocross
          Boardkiller
          • Feb 2014
          • 3553
          • slovakia
          #3
          Re: nvidia ic undervoltage

          so using regulator hw mod is easyest and safest way?

            Comment

            • Th3_uN1Qu3
              Believe in
              • Jul 2010
              • 6031
              • Romania
              #4
              Re: nvidia ic undervoltage

              Yes. Since you have the laptop apart for repair anyway, might as well change one resistor and do the undervoltage mod too.
              Originally posted by PeteS in CA
              Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
              A working TV? How boring!

                Comment

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