XFX XXX edition 1GB ROM with revision F EFI
I created a new custom ROM file for XFX XXX Edition card listed above with the revision F EFI rom from the latest shipping Apple 4870 cards. While it works just as well as the old ROM, it doesn't appear to fix the 2.5 GT/s link speed issue, nor the 2nd DVI port is only single-link issue. I've attached the ROM file should you be interested in trying for yourself. Again, I am no way responsible if this ROM bricks your card. Use it entirely at your own risk.
As per multiple forum requests, I am posting the custom ROM file that I made using pipomolo42 instructions (with slight adjustments for the original bios size). As I indicated earlier, this ROM was built for a XFX Radeon HD4870 XXX Edition 1GB PCI-Express Video Card purchased from a local Fry's, model number HD-487A-ZD. So far this ROM seems to be working great - the card is fully functional in both OS X and Windows, though it does have the same issue everyone else is getting where the secondary DVI port will only function in single-link mode.
Obligatory CMA: I am no way responsible if this ROM bricks your card. Use it entirely at your own risk.
I created a new custom ROM file for XFX XXX Edition card listed above with the revision F EFI rom from the latest shipping Apple 4870 cards. While it works just as well as the old ROM, it doesn't appear to fix the 2.5 GT/s link speed issue, nor the 2nd DVI port is only single-link issue. I've attached the ROM file should you be interested in trying for yourself. Again, I am no way responsible if this ROM bricks your card. Use it entirely at your own risk.