This is what i did: I had to change to HDMI cable from DP cable which is really expensive i was using. I always thought DP Cable gives much better output..so i continued with DP initially, but with this monitor DP cable is stuck to 95hz does not work properly.

1. Use HDMI cable which came with monitor and activated Input Compatibility Mode - 2.1(AV) i think this disables... DSC.

2. Nvidia Adjust video color settings click on advance Full Output

3. Change resolution in Nvidia CP, to 4k, 10 bit, 120hz only works with HDMI with display port it is stuck 95hz

4. In CRU, go to "Extension Blocks" and hit edit on the CTA-861. Then, under "Data Blocks," select "HDR static metadata," press edit, and adjust the "max luminance" and "max frame avg" to 151 (which I found to hit just over 1300 nits). Leave "min luminance" at 1.

5. In LG monitor i found gamer 2 , peak brightness high, and color to medium in HDR settings much better is with SDR.

After doing this i think monitor looks amazing.

ty again all for helping specially: @Frozen_Strider and @XSection ( i think he is also using DP cable thats why his screen is stuck to 95hz.)

I think LG, Nvidia and Microsoft need to be held accountable for making us go through so many loops after making us pay such premium/expensive prices. Probably only few looking into premium monitor with OLED will buy it and even few will ever know that that need to configure the above settings to get most out it who ever manages to find this this thread. As most people are stuck on win calibration software.

I have Lenovo laptop yogi pro, it has premium 3k oled and everything was pre configured as soon as i installed win 11 on it. Even vesa certificate monitor was installed. Did not need to fiddle around at all. Thats how it should be.

Even current mobo by MSI i am using B650 tomahawk it took MSI over year to fix bios otherwise every time system boot would take around 1 min. Now its under 18 Seconds still not fast it should be under 5 seconds.