1. Please see my Z390 thread, post #3 (link is below in my signature) for info regarding which system definition to use. Personally, I use iMacPro1,1.
2. Generally, WhateverGreen is good. It does a lot of things to help get GPUs running right.
3. I don't know of any methods to enable temperature monitoring for Navi cards currently. I also do not have temperature monitoring for my Radeon VII.
4. I don't know of any methods to control the fans for Navi cards currently.
Also, please see the follow thread regarding overclock stability:
I have my Hackintosh up and running very nicely thanks to all the posts in the forums. My CPU is an 8700K and I have it overclocked to 4.8GHz and everything seems to run just fine. The issue is that sometimes when I compile our software the actual compiler seg-faults and dies. I have never seen...
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