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I love my Gigabyte 7970C EFU flashed.
I had to use a compatible machine to get access.
That used to be my GoTo. But it's been discontinued and does not support the new schemes.
Command line is the only way to go for now.
You can google its options - target startup disk, APFS conversion etc.
That is the one I have. It needs to support Metal.
Have your tried the command line I mentioned? It fixed it. But do not yet try this...
haralds posted a new thread.
My Mac Pro 5,1 mid 2010 with 2012 processors has the prerequisite for beta 2 - Metal capable Radeon 7970 and no FileVault.
The 3,1 I have set up for my wife is running a custom Fusion drive configuration which gives you pretty much the SSD performance in real...