Adaptability issue with RTX 2070 super and LG OLED C9

[Dr Shrivardhan]

Hello everyone,

I use my custom gaming rig with RTX 2070 super and recently tried using with LG OLED C9 55 inch as monitor. But, I couldn’t achieve 4K resolution with 120hz refresh rate. The TV firmware and nividia drivers are up to date.

 

Rig configuration is: 

AMD Ryzen 7 3700x with stock cooler

DDR4 3200MHz 16 GB ram

500GB SATA SSD

ROG strix RTX 2070 super

can anyone guide me where I am going wrong? 
Although I can achieve 2k resolution with 120Hz but not 4K. 
 

thank you.

[Freakwise]

Are you connecting it to hdmi 2.1 port with hdmi 2.1 cable 

[Dr Shrivardhan]

I am connecting hdmi 2.1 port but not sure about hdmi 2.1 cable. Can you guide how to identify the hdmi cable?

[leclod]

36 minutes ago, Dr Shrivardhan said:

I am connecting hdmi 2.1 port but not sure about hdmi 2.1 cable. Can you guide how to identify the hdmi cable?

Probably if you didn't recently buy a 2.1 cable, you have a 2.0 or lower

(also a 2.1 cable would show off with 8K or 2.1...)

[Glenwing]

RTX 2070 doesn't support HDMI 2.1.

[Ramon Triton]

You need RTX 30 Series to enable 4k 120Hz, the best you can achieve with a RTX 2070 is 1440p 120Hz.

[CTR640]

Or 4K/120 4:2:0 if I'm correct.

[Ramon Triton]

In theory that should work since set that way it requires 17.82 Gbps and HDMI 2.0 max bandwidth is 18 Gbps. I tested it out of curiosity on my C9 and the screen goes haywire lol.

 

Here are my recommended settings for now until you get an HDMI 2.1 graphic card.

2560 x 1440p

120 Hz

10 bpc color depth

YCbCr 4:2:2 color format

Limited dynamic range (don't forget to set your Black Level to LOW on your tv)

And better not label your HDMI input as PC on your OLED, they may have fixed it since then but at one point the input lag was a bit higher if you set your input label as PC instead of anything else.

Also turn on Instant Game Response on your OLED and using the GAME picture mode.

That's it, enjoy !

[CTR640]

13 hours ago, Ramon Triton said:

In theory that should work since set that way it requires 17.82 Gbps and HDMI 2.0 max bandwidth is 18 Gbps. I tested it out of curiosity on my C9 and the screen goes haywire lol.

 

Here are my recommended settings for now until you get an HDMI 2.1 graphic card.

2560 x 1440p

120 Hz

10 bpc color depth

YCbCr 4:2:2 color format

Limited dynamic range (don't forget to set your Black Level to LOW on your tv)

And better not label your HDMI input as PC on your OLED, they may have fixed it since then but at one point the input lag was a bit higher if you set your input label as PC instead of anything else.

Also turn on Instant Game Response on your OLED and using the GAME picture mode.

That's it, enjoy !

Is it easy to label HDMI other than PC? Or does LG automatically label it as PC?

 

I assume the Limited dynamic range is to prevent black crush?

[Ramon Triton]

LG doesn't automatically label it as PC but yes it is easy to rename if you wish, again I don't recommend it tho. I use limited dynamic range because if you use full dynamic range you'll be stuck with 8 bpc color depth and since the OLED panel is native 10 bpc might as well use limited dynamic range and take full advantage of the panel's capabilities.

[CTR640]

19 hours ago, Ramon Triton said:

LG doesn't automatically label it as PC but yes it is easy to rename if you wish, again I don't recommend it tho. I use limited dynamic range because if you use full dynamic range you'll be stuck with 8 bpc color depth and since the OLED panel is native 10 bpc might as well use limited dynamic range and take full advantage of the panel's capabilities.

What about the black crush? Do I need to adjust some settings in TV settings or Nvidia control panel? HDMI is notorious for that.

[Ramon Triton]

To prevent black crush just make sure these settings are in sync.

Limited on PC = Low on TV

Full on PC = High on TV

[Ramon Triton]

Btw I mentioned previously that I recommend 10 bpc at 4:2:0 but I forgot to specify ONLY while gaming in HDR at 1440p 120 Hz. If

you play games in SDR, do some browsing or any kind of work you should use 8 bpc at RGB since the 4:2:0 color format affects text clarity.