boot screen and Mac OS recovery mode?

[rjtiedeman]

If you install a standard Sapphire RX580 in my cMP 5,1 will it restart in recover mode (Option-Command-R) for running disk warrior or apple system utilities?

 

[bookemdano]

Yes, recovery mode works with any card that has drivers built into macOS, including the RX 580. But the correct key combo to invoke it is Command-R. Command-Option-R is for Internet Recovery which the cMP does not have.

 

[crjackson2134]

If you install a standard Sapphire RX580 in my cMP 5,1 will it restart in recover mode (Option-Command-R) for running disk warrior or apple system utilities?

Command+R works fine. Few seconds of black screen, then as recovery mode loads it's drivers, you will have normal video.

I THINK Command-Option-R is for internet recovery mode (not sure though). This doesn't work with a cMP. They NEVER had internet recovery option. Command-R works fine however.

 

[startergo]

You can also change the startup drive from within Mojave to the recovery mode with blessing.

 

[rjtiedeman]

thank you all for clearing that up. that makes updating the old GPU to a RX 580 and Mojave more manageable.