Adding Radeon RX590 to 10.12 killed it

I had 10.12 running smoothly with Intel's integrated graphics (i7-4770K). I'd configured it with TonyMacx86/Clover procedures a couple of years ago. When I added an Asus Radeon RX-590 card, the system would hang during boot, shortly changing to graphics mode.

Since I understand that ATI graphics are supposed to be supported, natively, does anyone have suggestions on what I should try doing to "let" this happen?

submitted by /u/wrlee
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