Volt-mods mobile graphic card

Discussion in 'Hardware Components and Aftermarket Upgrades' started by SunnyChrono6, Apr 6, 2012.

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  1. SunnyChrono6

    SunnyChrono6 Notebook Enthusiast

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    Hey everyone,
    Can someone tell me how to under-or-over volt my 8400m gs(with a g86 core)?
     
  2. tqbinh

    tqbinh Notebook Enthusiast

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    For mobile GPU you usually can not do software/BIOS voltmod because GPU BIOS is integrated into laptop BIOS.

    Instead, you can do hardware mod (or enable ASPM to save power).
    See my posts here and here
     
  3. Marecki_clf

    Marecki_clf Homo laptopicus

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    Load of BS. There are SOME laptops with discrete GPUs, whose vBIOS has been integrated with the laptop's BIOS. Majority of laptops with discrete GPUs, however, have separate vBIOS, so there's no problem with using RBE, NiBiTor, atiflash, nvflash and so on. I've done it numerous of times with different brand laptops.
     
  4. funky monk

    funky monk Notebook Deity

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    Even if the vbios is located in the main bios, you can still edit it if you know what you're doing.
     
  5. Meaker@Sager

    Meaker@Sager Company Representative

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    Have you checked the power delivery system is capable of the voltage you want to set? It could well be a hard-line rail with no control. In this case you may have to break out the soldering iron if you even have any access to it on the PCB.
     
  6. SunnyChrono6

    SunnyChrono6 Notebook Enthusiast

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    Yes,I think the power delivery system is capable of handling the voltage I want to give (1.15v),as that is the 2nd voltage of the card.I want to set this voltage as the 3d voltage too.How do I do that?
     
  7. Meaker@Sager

    Meaker@Sager Company Representative

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    How do you know that?
     
  8. SunnyChrono6

    SunnyChrono6 Notebook Enthusiast

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    Because it says so in GPU-Z and HWMonitor. And,it's lower than the 3d voltage of 1.2,so I'm assuming it's right.
     
  9. Meaker@Sager

    Meaker@Sager Company Representative

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    Then you will need to extract your bios system bios, find the vbios within that, edit it using nibitor or the like and then repackage your bios with the changed file and flash it to your system.

    Voltmodding means people usually want to raise their voltage, while technically correct most people use the term undervolting instead when talking about lowering the voltage.
     
  10. SunnyChrono6

    SunnyChrono6 Notebook Enthusiast

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    Ummm....actually,I did want to over-volt in the beginning,and I still would like to,but I wasn't sure whether that would be easily possible.......anyway,can someone guide me through extracting the vbios from the bios?
     
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