[Problem] Clevo P775TM1-G RTX3080 16G with 128GB RAM

I have been using @dsanke modded BIOS for P775TM1 with 128GB RAM and RTX2000-series with no issues.

When I try to use a Clevo RTX3080 MXM, system will not boot. HDD led will blink shortly but screen remains black. GPU will force a shutdown of the system, when overheated with unscrewed heatsink, indicating the MXM card has been properly detected. This specific issue does not occur with 96 GB RAM.

Forcing PGI to PCIe x8 and setting Gen3 instead of auto does not fix the issue.

Any suggestions on how to debug/fix the issue?

Issue fixed per suggestion of @Kuri0 ([Guide] How to make Z370 chipset MBs compatible with 128GB RAM - #54 by Kuri0).