Brand new setup.
The 1st kernel panic happened right after I completed the initial setup (with OEM RAM).
After I installed 128GB OWC ram, kernel panic again. Then I contacted Apple support. I was on the iMessage with them for 3 hours, installed macOS twice, till 3 AM. As soon as they close the case, kernel panic again.
I returned OWC, installed Crucial (4X32GB) yesterday, again and again.
When the machine works, everything is so smooth, the 10 core CUP helps a lot on my multiple scenarios simulation.
But, when kernel panic happens, I just want to go back to my Lenovo P52.
Oh I also want to mention kernel panic issue happens on both Catalina and Big sur Beta
I have had almost identical kernel panic issues on my 7,1 Mac Pro with the w5700x GPU and Catalina (but no display glitches). 2/3 of the people who responded to a poll I posted that have the 5700 GPU on a 7,1 with Catalina say they have no problems... 1/3 DO and have not found a solution! Knowing what I know now, I would just return the machine and hope for better luck next time. I honestly have no idea what the cause really is. Apple finally agreed to replace my machine two weeks ago (saying they "think" it is the logic board?) and took a credit card number to place a hold on it, but I never heard another word?