Radeon VII not letting me enter bios

So I'm having a super weird issue with my Radeon VII that I recently got for my Hackintosh.

My Vega 64 works perfect and I've had no issues with it, but when try and replace it with the Radeon VII I ordered, it won't let me get into the bios at all which is super odd. My computer will start up and I see no display upon initial startup and I do not get the usual Gigabyte Aorus bios display screen, and only later in the boot process do I finally see output from the display and this only happens once Mac OS is almost fully loaded. I'm sure if my windows SSD was set to my primary boot device it would do similar behavior if trying to boot into windows, but my Mac OS configuration should have no bearing on me not even being able to enter the bios properly.

I'm pretty stuck here and confused about what's going on. This system has been really stable for me but this one is throwing me off. Here's my full specs:

delidded 8700k @5.1ghz

Radeon VII/Vega 64

Seasonic 850w Prime Gold

Gigabyte Aorus 5 Gaming z370 motherboard

32gb 3200mhz G.Skill Trident Z

Noctua D15s cooler

Radeon VII not letting me enter bios

submitted by /u/MattRobertson777
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