Overclocking 4890 in OSX

Discussion in 'Mac Pro' started by exabrial, Aug 31, 2009.

  1. exabrial macrumors member

    Mar 4, 2008
    Using Netkas' Hybrid EFI ROM, I'm able to use a 4890 in Osx :D

    In windows, I can easily clock my card up to 975mhz without stability issues. I'd like to repeat the performance in OSX, because the card runs at a much pokier speed.

    Is it possible to hexedit the efi portion to do this? Has this been covered and my searches just unsuccessfully?
  2. MacVidCards Suspended

    Nov 17, 2008
    Hollywood, CA
    Just changes speeds in PC portion of ROM. All EFI does is say "Hi, How are ya" and give you a couple boot screens. After that it is running from PC BIOS.

    Try using Radeon BIOS Editor. (goes by Rabit, I think)

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