Hey Guys, Got the Gigabyte R9-280x (REV2) PC version card and put in in my mac. Everything worked great, but I did not have the EFI boot screen. I edited my rom and added the EFI. Everything works great now... If anyone has this (REV2) card, feel free to download my EFI rom. My Origional Rom: GV-R928XOC-3GD - Device ID: 6798 EFI Rom: Gigabyte-R9-280X.efi.rom Link To Download https://www.wetransfer.com/downloads/f6162b9d928d6ad6a5134f70f25c1fd020141126213401/cfe14f Backup your origional first. Enjoy Your EFI Boot Screen!