Hello, I have a Mac Pro 2008 and HIS HD 6850 IceQ X Turbo graphic card (PC/no EFI), with no other graphics card EFI I can not boot on OSX. Here the bios extracted with GPU-Z.0.7.8 : HIS_HD_6850_IceQ_X_Turbriginal_Bios If someone can add EFI and post the modified rom, that would be great ! I could install OSX ! I have another question for solve the problem PCIE@1.1. I saw here the procedure but is it the same for the HD6870 and HD6850 ?