Flashing a HD4870 without PCIe power cables ?

Discussion in 'Mac Pro' started by Macschrauber, Jun 11, 2016.

  1. Macschrauber macrumors member

    Joined:
    Dec 27, 2015
    #1
    Hi Folks,
    Long story short: I bricked a HD4870 with flashing the wrong Rom File. The Mac now boots no more, the boot chime is cut and the Mac (1.1) is into a boot loop. No chance to re-flash it, even with a second GPU.

    So I got me a cheap PC to flash it back to the saved rom file. But the PCIe Power Cables do not fit in the box. I use on Board Video of the PC and all what I get from an ATIFLASH -i is that it founds no Card. Is it due to the missing PCIe Power ? Is the Power Supply Of the Slot enough for just flashing it ?

    Tia and cheers
     
  2. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #2
    In my own test, the cable is required for the 4870.
     
  3. Macschrauber thread starter macrumors member

    Joined:
    Dec 27, 2015
    #3
    Just to double check I got you right... You tried to access the card with atiflash and it found no adapter ?
     
  4. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #4
    No, but the card need both cables plugged in to function correctly. And I don't think it's a good idea to flash the card if it doesn't boot properly. Your aim is to safe the card, but not further kill it, right?
     
  5. Macschrauber thread starter macrumors member

    Joined:
    Dec 27, 2015
    #5
    Yes, I don't want to use the card in this PC, I just want to unbrick the card by flashing the right rom. I need to use the PC because the Mac do not boot with the bricked card in, even if not in use and with a working card in another slot.
     
  6. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #6
    You may check the Netkas forum, there may be some method to short the pins and recover the card (make it flashable again).
     

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