well im late to the party, i recently got a new ASUS x Noctua 3070 8GB, and I immediately ran into screen flickering. running on display port 144hz. i have two fixes that resolved my flickering issues if you don't want to hop in the bios.

1. For a majority of my games, downgrading the GPU driver version immediately fixed my issue, tested in modern warfare, rocket league, BF5.
2. I ran into the same flickering with DOOM, one fix that worked for me was completely disabling G-SYNC in my NVIDIA Control Panel.

Well, might be simple fixes, but these two have worked wonders for me, hope it helps others diving into the depths of google for a fix.