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    How to undervolt GPU

    Discussion in 'Gaming (Software and Graphics Cards)' started by thinkpad knows best, Feb 27, 2010.

  1. thinkpad knows best

    thinkpad knows best Notebook Deity

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    How can i go about doing this? Do you need to edit the GPU BIOS to permanently change voltages or can it be software level?
     
    thinkpad knows best, Feb 27, 2010
    #1
  2. hirush

    hirush Notebook Evangelist

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    What graphic card you want to undervolt?
     
    hirush, Feb 27, 2010
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  3. sean473

    sean473 Notebook Prophet

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    sean473, Feb 27, 2010
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  4. sgogeta4

    sgogeta4 Notebook Nobel Laureate

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    He didn't undervolt the GPU. That requires BIOS mod or hard mod.
     
    sgogeta4, Feb 27, 2010
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  5. thinkpad knows best

    thinkpad knows best Notebook Deity

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    That's not really undervolting though dude, just underclocking, i can do that easily.
     
    thinkpad knows best, Feb 27, 2010
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  6. Rorschach

    Rorschach Notebook Virtuoso NBR Reviewer

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    use nibitor and nvidia flash utility to do it. When you load your bios into nibitor there is a voltages tab that should allow you do drop it down by at least .05. You really won;t see much of a temperature difference unless you drop it more than .05 though.
     
    Rorschach, Feb 27, 2010
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  7. mew1838

    mew1838 Team Teal

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    Its not worth it if you are not comfortable with messing with BIOS.
     
    mew1838, Feb 27, 2010
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  8. hirush

    hirush Notebook Evangelist

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    I don't know what gpu you want to undervolt but as Rorschach said, get nibitor, nvflash, and gpuz. I only done it on my geforce 9800m gts and it worked for me. Lowering it to 0.95v from 1.1v

    GPUz for extracting vbios from video card
    nibitor is to modify gpu volt and core, memory clock setting
    nvflash to flash bios to video card

    Rorschach did you mean lower 0.05v? cuz 0.5v that's a lot!
     
    hirush, Feb 27, 2010
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  9. weinter

    weinter /dev/null

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    1)Use GPUZ/Nibitor to dump your VGA BIOS
    2)Use Nibtor to edit the voltage using Exact Mode.
    Note: I asked Mav the programmer of Nibitor he said modifying the VID Labels do not drop the voltage instead in Nvidia VGA BIOS they have 3 VID the most you can do is force the lowest VID on the higher Power State using Exact Mode
    3)Create a DOS Bootdisk put nvflash on it and flash the modified BIOS.
    Note if GPUZ and Nibitor is unable to dump your BIOS even when you run it with admin rights it means your VGA BIOS doesn't exist as a discrete ROM so you have to dump your main system BIOS and extract the VGA BIOS from it.
     
    weinter, Feb 27, 2010
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  10. Rorschach

    Rorschach Notebook Virtuoso NBR Reviewer

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    lol yah fixed.
     
    Rorschach, Feb 27, 2010
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  11. sean473

    sean473 Notebook Prophet

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    not underclocking... i had game temps drop my 10C in games... also i was running an OC.... original temp with OC in Games : 85-89C

    Now 72-76C...
     
    sean473, Feb 28, 2010
    #11