Need help flashing 7800 GTX 512 for Power Mac G5

Discussion in 'PowerPC Macs' started by takeshi7, Jan 12, 2014.

  1. takeshi7 macrumors newbie

    Joined:
    Jan 12, 2014
    #1
    Hi,

    I've been trying to flash my XFX 7800 GTX 512 MB so that I can use it in my G5 quad. I've tried flashing every ROM from this thread:
    http://forums.macrumors.com/showthread.php?t=1552556
    When I try to run nvflash from a bootable USB disk it says that "this program can't be used in DOS mode" so I've been running nvflash from within Windows 7. I was able to back up the ROM file that's on the card with nvflash, but when I try to flash a new ROM it beeps twice and nothing happens (I think I see a command prompt window open for a split second though). Any help would be greatly appreciated.
     
  2. ifrit05 macrumors regular

    ifrit05

    Joined:
    Dec 23, 2013
    Location:
    Near Detroit, MI. USA
    #2
    Never use Windows to flash BIOS/ROMs!
    What kind/version of DOS are you trying to run? nvflash should run in DOS mode (it is a DOS program).

    Have you tried FreeDOS?
     
  3. takeshi7 thread starter macrumors newbie

    Joined:
    Jan 12, 2014
    #3
    I was using a windows 98 boot disk created with the HP USB Disk format tool.
    http://download.cnet.com/HP-USB-Disk-Storage-Format-Tool/3000-2094_4-10974082.html

    I was using nvflash 5.142 and it definitely wouldn't run within DOS on the USB stick, but it did run within windows.
    http://www.techpowerup.com/downloads/2258/nvflash-5-142-for-windows/mirrors

    I was able to at least back up the ROM that is on the 7800. nvflash would then recognize that the original PC ROM was compatible with the card, but when I tried to open any of the Mac ROMs with nvflash it would close and flash a message on screen along the lines that the rom isn't compatible.
     
  4. ifrit05 macrumors regular

    ifrit05

    Joined:
    Dec 23, 2013
    Location:
    Near Detroit, MI. USA
    #4
    You could try an older version of nvflash, that might work. I know I had to use an older version to flash my FX 5500 to a Mac Rom.
     
  5. 666sheep macrumors 68040

    666sheep

    Joined:
    Dec 7, 2009
    Location:
    Poland
    #5
    Nvflash for Windows won't work in DOS ;)
    Version 5.67 will be fine for 7800GTX.
     
  6. takeshi7, Jan 14, 2014
    Last edited: Jan 14, 2014

    takeshi7 thread starter macrumors newbie

    Joined:
    Jan 12, 2014
    #6
  7. ifrit05 macrumors regular

    ifrit05

    Joined:
    Dec 23, 2013
    Location:
    Near Detroit, MI. USA

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