The second issue is video output from the ports. You can also get a card with dual-VBIOS for dual booting. If you don't intend to use it with Windows, it's a non-issue.
NEED AMD RX 480 ROM EDITOR FOR MAC DRIVERS
The first one is BIOS signature enforcement in Windows that prevents AMD drivers from loading (error 43). Keep in mind there are drawbacks to this mod.
NEED AMD RX 480 ROM EDITOR FOR MAC MAC
If all goes well macOS will detect your RX 480/580 correctly as "Radeon RX 580" in About this Mac and System Information for as long as Apple supports the Sapphire RX 580 Pulse 8GB. Once this is done, you can flash your RX 480/580 8GB with this modded VBIOS. It will tell you to save the VBIOS in order to fix this error.Ĥ.
Open this part-number modded VBIOS in PolarisBIOSEditor. The new VBIOS ROM will have an invalid checksum and you won't be able to flash your card with ATIWinFlash just yet. If part number of your RX 480/580 has less characters then try matching 113-4E353BU-O4E as close as possible.ģ. You'll notice I added an extra character "1" to 113-4E353BU-O4E because the original part number has one more character than my RX 480's part number. Replace it with the desired partner number that macOS identifies as "Radeon RX 580". Open the VBIOS in a Hex Editor of your choice and search for this part number (I used HxD). Take note of the part number in the original VBIOS. I used a reference cooler RX 480 8GB for this guide.Ģ. Make an extra copy of the ROM to restore the original VBIOS to your GPU should things go wrong. Save the original VBIOS of your RX 470/480/570/580 with ATIWinFlash in Windows. The more permanent way but more involved is to edit the VGA BIOS to show itself as 113-4E353BU-O4E or 113-4E3531U-O4V. This has to be done following every macOS update. The easy way is to edit the controller file in macOS to show the right name for your AMD GPU. There are a couple of solutions to remedy this cosmetic issue. macOS checks for either one of these Part # in order to show " Radeon RX 580" instead of " AMD R9 XXX" in About this Mac. There are two part numbers for this particular RX 580 113-4E353BU-O4E and 113-4E3531U-O4V. This is due to it being used in the official external graphics dev kit. The Sapphire RX 580 Pulse 8GB is the only current generation AMD GPU identified correctly in macOS.
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