Yes it is the pro version of the Vega 64 (16 GB RAM, 10 bit video out) so I've been using your Vega 64 aml since 2018. Today I learned that XMP memory profiles should be used with 32 GB or less of memory, I have 64 GB DDR4 3200. So in BIOS I put in my timings manually, upped the voltage, lowered the RAM to 3100 MHZ and disabled XMP. So far, things in Mac OS are more snappy.
Blackmagic Raw went from 40 fps on CPU to 52, and 98 FPS on GPU to 150 FPS just by changing BIOS RAM settings

I don't know if the freezing is fixed because it is so intermittent.
Here's my logic: it will cost me $3,601.46 (with education discount) to buy a Mac Studio base (10 Core, 32 core GPU, 1 TB HD) because I need to buy external PCI case and external thunderbolt case for my set up of cards and hard drives.
It will cost me $1,885 to build an 19-13900k with 6950XT with Z690 (and using parts from my current hackintosh). Maybe $2,000 if I buy super fast RAM.
So I'm still $1,600 cheaper doing a hackintosh now