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There is 1 bios here but it is fot a totally different subsystem id, there is a major risk of bricking when syb system ids arent matching. So if 1 bios fails to run the monitor, you flip to the working bios and get monitor running then you flip to bad bios to reflash it. Flashing An Amd Radeon R9 380 Pro Efi Mod My OwnFlashing An Amd Radeon R9 380 Pro Efi Code And MyOnce I got the original ROM flashed backed onto the card, I tried to mod my own ROM with a script from another site, some MacEFI code and my original ROM. After a few false starts I created a modded ROM, but it worked no better than the standard PC ROM. I finally had to track down a custom ROM someone else built and flash the card with it. I now have the Mac boot screen, but HDMI and DP output is flakey. Fortunately, I have a couple of DVI monitors I can use with the card. Or a fellow modder will see it and potentially fix the issues. The original modder reported that he had issues with the DP port. However, I think the MAIN difference between a Mac GPU and non-Mac is going to be if it is Metal capable. Flashing An Amd Radeon R9 380 Pro Efi Upgrade Past HighSee the following link for more details: Metal Capable GPU and Mac OSx Upgrade The short answer is that if you want to upgrade past High Sierra, you need a GPU that is Metal capable. And you can easily see in your System Preferences if an installed GPU is Metal capable. ![]() And THEN I suppose hope that your board is whatr it CLAIMS to be, and not a pirated version.
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