I think the 1060 is a better choice unless the RX480 can provide unaccelerated screen before kext edit.
If both card only shows black screen after every OS upgrade. It's better on the Nvidia side because you know if the driver is there before you do the OS update.
I wonder if gtx 10 series show boot screen or not with the most recent driver.
No other way to flash it by myself?^^^^Here:
http://www.macvidcards.com
See this thread:
https://forums.macrumors.com/threads/my-mvc-flashed-gtx-1080.2043192/
Lou
No other way to flash it by myself?
Yes, but you have to write the Mac EFI by yourself.
any link that I can try?
It's going to require a massive amount of study, as well as a lot of trial and error. It would be both wiser and more economical to get MVC to do it for you, that or buy a cheap graphics card with Mac EFI for the rare opportunity that you need a boot screen.