Failing that, I'm not clear how you would get a card-specific EFI BIOS for boot screen support. You could try just powering it with the TWO x Mini 6pin to ONE by 8 pin. If that assumption is correct, then it would lead me to believe that adding an EFI BIOS that works on a similar card (R9 280X or 7950 which are both close but not quite) should work since I'm assuming that the existing BIOS would be similar enough to hook in. You definitely DONT need the Pixlas mod to power the Sapphire RX 580. To some degree, I've recently come away with the notion that you don't get rid of the existing BIOS, but rather add an EFI partition to it that the Mac would recognize. I've seen numerous guides on the internet about flashing the BIOS on the video cards and also ones that speak about adding the EFI BIOS, but in the haphazard forum approach, it isn't clear how this all works. Radeon RX 580 8 GB graphics card on macOS High Sierra (as of 10.13. The card is supported on the Mac once it boots, but I would like to get boot screen back since my old 8800GT has been baked in the oven a few too many times by now :-) I've got a PC video card that I'd like to get boot screen support for on my Mac Pro.
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