If you want a metal supported gpu with a boot screen you will have to have a custom firmware flashed into the gpu or you could use my other solution
My other solution is to use 2GPUs
Your Mac Pro has 2 slots that have 16lanes (that means you can have 2big gpus in them)
(If you look carefully you can see that it says X16 on both of them)
So what I would do here is get a good gpu that doesn’t need psu modifications like the RX570 or 580 and put that in one slot then get a gpu that does have a boot screen like the GT120(Mac edition) and put than in the other X16 slot you have
I recommend using the GT120 as it won’t need any power cables as it will run of if the pci power
You will also need 2 monitors for this to work unless you want to swap your display cable over every time you want to use the boot screen
Then you should be all set to go!
You could use the GTX680(Mac edition) as if you get the right one it will have a boot screen but it’s a little old or you could get one that is flashed
The decision is yours so it’s up to you:-)
Hopefully this helps
Any questions please ask
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