So. Bought Samsung q80t, connected to it laptop with video card rtx 2060 in port tv hdmi 4. In the settings only 2560x1440hz mode. No 4k 120hz. Then I bought a new hdmi cable version 2.1. Again there is no 4k 120hz. Then I downloaded the utility cru resolution and could get 4k 120hz. Vrr with hdr 4k 120hz worked great. Then i connected to the laptop my old hdmi cable ver 1.4. 4k 120hz working great vrr with hdr works in all ports hdmi ( hdmi 1, hdmi 2, hdmi 3, hdmi 4) with my old cable. How can this be?
Yeah I was getting 120hz on Hdmi 3 as well on my 3070, I couldn't use HDMI 4 because it would flicker and cause issues because this model has issues with HDMI 2.1 at the moment.
But you will find it's only 4:4:2 when using HDMI port 3, you still get 120hz 4k though.
I didn't have to even setup a custom resolution or use CRU, it's just available in the PC list of resolutions listed.
Hey my dude. I got my 3090 a couple of days ago and I have a Samsung 80T 65inch. I bought a Belkin Ultra HD High Speed HDMI Cable for $100 at JB. Connected 3090 to 80T VIA HDMI PORT 4 - Took a minute to gain signal. Went on my pc (Windows 10) - Display Settings - Clicked on the display - HDR ON - Display Resolution 4096 x 2160 or 3840 x 2160 - Advanced Display Settings - Refesh Rate 120.000 Hz. Then (Went to my Samsung 80T Settings) Turned on Game Mode. Works like a charm. Here is the HDMI I used as a link - https://www.jbhifi.com.au/products/belkin-ultra-hd-high-speed-hdmi-cable-2m