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Voltage locked HD 7970 :l

Discussion in 'Overclocking & Cooling' started by HooHooH, Aug 17, 2014.

  1. HooHooH New Member

    Aug 17, 2014
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    I don't know if this is in the right forum, but I can't unlock voltage in MSI AB, and the version of GPU Tweak I am using has voltage unlocked, but is in sync with core clock, and I can't overclock core clock past 1125mhz in GPU Tweak. The card I have is an Asus HD 7970 DC2. Other forums and websites say that this HD 7970 is voltage locked. Is that true? I already tried MSI AB cfg thing, doesn't work. I don't want to risk flashing bios. Is there another way? Sorry if this has been asked a billion times.
  2. Law-II


    May 9, 2011
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    Mainland Britain

    Welcome to TPU

    Yes; voltage is locked [*took a look at a few of the vbios images found in the TPU database]

    This would not be possible anyway in a conventional vbios editor as the voltage controller is hard locked, vbios image would need to be Hex edited and with no way of testing stability very time consuming

    HD 7970 DC2 looks to offer VGA Hotwire which allows you to plug and solder wires on the card’s voltage regulators and accurately read and control Vcore, Vmem, and PLL voltages on a hardware level [*limited to Asus ROG motherboards]
    Source here
    maybe a *hard mod soldering wires and resister/s to components on the PCB [not something I do or recommend]
    (*other members of TPU may be able to assist)

    Note: before invalidating the warranty sell the vga card and buy one that is voltage unlocked out of the box

    Note: for future reference post in the AMD/ATI section here


  3. cadaveca

    cadaveca My name is Dave

    Apr 10, 2006
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    Parkland County, Alberta
    only v1.00x DCUII 7970 can be modded, v 1.01x does not offer voltage control, nor does HotWire work correctly(it lowers voltage rather than raise it). You can find version number on back of PCB. If voltage control does not work via software, then you are simply SOL.

    I personally tested every which way to do it. There are quite significant changes to VRM controller design in PCB versions. You can see version number in my pic here(with alternate mod point used, even):

    Law-II says thanks.
    10 Year Member at TPU

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