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macrumors member
Original poster
Jul 29, 2008
I've read through many threads over the years, but don't think I've ever encountered a straight answer to this, or if it was there, I totally missed it.

Let's say I upgraded to the Apple recommended Sapphire Radeon RX 580 Pulse. I know I would lose the bootscreen that I currently have with my flashed 7950.

However, would the different startup options still exist if I booted with the option key, even though they are not displayed? Could I blindly choose to boot into Windows 10 or my recovery partition, by using the arrow keys and return to select my preferred startup disk? Or is is that, without a supported bootscreen GPU, those options simply don't exist at all and cannot be chosen blindly?

If I know the necessary keystrokes, it seems that living without a bootscreen wouldn't be that much of an inconvenience except for perhaps the times I would misjudge and boot into the wrong place.


macrumors 601
Mar 6, 2013
Charlotte, NC
The option key start won't exist. However, CMD-R will give you your recovery partition, and you can select your windows disk by using the Startup Disk Applet in settings provided it's not an EFI install. El Capitan & Mavericks won't work with the RX580 as they have no built-in driver support for that GPU. You will need High Sierra or Mojave, and you need to leave the older macOS's behind.

I think Sierra MIGHT have drivers for the RX580 but I'm not sure on that one, so I didn't recommend it. Someone else will jump in and clear that up.

Mac Hammer Fan

macrumors 65816
Jul 13, 2004
I can live without a bootscreen. I use a GTX 980 without problems in HS and I have ordered the Pulse Sapphire RX 580 for my second Mac Pro 5,1.
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