There is no flicker as it's an lcd, unless you want to enable black frame insertion for less blur but with flicker. If you mean freesync or g-sync compatible you have to enable it on monitor first via OSD and then on your gpu control panel. For it to work then you need to run a game full screen...
I'm using the icm file provided by Gigabyte on their website (before they took it off for whatever reason) and in Windows 11 the monitor is listed as Vesa Certified DisplayHDR 1000. I don't use the calibration tool as I find it looks ok as it is on default.
Also for people saying they see a...
ah interesting, I can't really tell the difference with text at 120 hz or 144 hz, I ran the cleartype utility which definitely make a difference for me.
I can also select 12 bit RGB at 144 hz in Nvidia control panel with displayport but not sure how is this even possible. I've read some users on reddit saying it causes frame skip or some others saying HDR color looks best this way, not sure what to think.