On the freezing thing:
I am pretty sure its not heat related. I managed to confirm the following:
- Vega VII as only enabled display adapter: boots but with blank screen
- Vega VII running with iGFX: Boots into MacOS GUI but freezes after a while (as noticed by others)
- Vega VII in PCI1 and Vega 64 in PCI2 and PCI1 set as primary display output: everything works and no freezing.
it looks like combining the Vega VII with iGFX causes the freezing to happen for me.
I think its framebuffer/driver related, not heat, and combining the two Vega cards works around this.
Hopefully we get better more compatible drivers in the next beta.