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Here is for who have hd7970 public edition and want to use on osx. I just offer 2 band HD7970 ( powercolor and MSI) (1dvi+1hdmi+2minidp) Way to flash your hd7970 (it's support 10.10, 10.11, 10.12) 1. flash the hd7970 on dos mode, bye atiflash.exe 2. backup your org hd7970 bios atiflash -b 0 back.rom (the 0 or 1 please type " atiflash -i " it will show your display card number is ) 3. flash the bios atiflash -f -p 0 stbefi.rom 4. restart the rom.zip include unoc.rom it's over clock and work on MSI hd7970, but it's need depend on your display card health...your know ... stbefi.rom I just adjust the clock for more stable. Running on AE with 4K render very stable.....(also MSI) try1.rom try2.rom above the 2 roms, MSI and Powercolor may work, you have to try. rom.zip