[SOLVED] Tv 120 hz problem in PC

[adaysep91]

Good morning everyone. I come dragging a problem and I would like to know if someone can give me a hand, because I can not find the solution .... I have my desktop PC with a ryzen 5 3600 and a Nvidia RTX 3070. In addition, I usually play on a Samsung TV, specifically the Q90T model. I have the resolution at 4K, and the screen at 60 hz. The problem comes when I try to set the screen to its maximum refresh rate, which is 120 hz. In this mode, constantly and arbitrarily the image goes black for a second or two, then returns, repeating this randomly. The problem disappears completely when I go back to 60 hz, but I would like to solve the 120 hz problem especially if I want to play at more than 60 fps. I have the hdmi 2.1 properly connected to the TV port which supports 4k-120 fps. In fact, with my previous gpu, a 5700 XT, I also had everything connected the same way, and the 120 hz mode did not give me this problem. Logically I also have all drivers and drivers checked, reinstalled using clean installs with DDU and updated to latest version. Also checked that the display drivers are updated, and as for the cable I doubt it is the problem because as I said before it worked perfect. I don't know if I'm missing something, but I've run out of ideas to try to solve this. I hope someone can come up with the key. Thanks.

 

[Rogue Leader]

Hi, first of all, thank you for taking the time to help me. I will answer you in parts to the 3 points you have indicated:

1. I have already tried putting the name PC in the HDMI label. In fact, I have tested in both PC mode and game console mode, but the problem persists.
2. I don't currently use HDR mode, but I don't know how to change what you say about 4:2:0 .... I'll attach some screenshots of my nvidia configuration in case it helps.

3. I have everything updated and checked.

Thanks

PD:
the first image is the configuration as I have it now so that it does not fail (2K-120 hz).

the second image is the other options, as you can see, in the native mode does not give me the option to 120 hz, and if I check the 4k resolution box but the one that does not put native in parentheses, there does appear the option of 120 hz, but that's when it gives problems.

I hope this helps a little.

https://ibb.co/R4fZbst

https://ibb.co/k1m1bz4

Based on that I think your cable may be the issue. HDMI allows for 2 way communication, that Cable is only offering the card 60hz resolution.

 

[adaysep91]

Based on that I think your cable may be the issue. HDMI allows for 2 way communication, that Cable is only offering the card 60hz resolution.

I will try with other cable.. some recommendation? Thanks

 

[Eximo]

I will try with other cable.. some recommendation? Thanks

I recommend watching the recent videos by Linus Tech Tips and their Totalphase cable tester. Surprising results when they tested all the cables they had and then some.

They had a few brand recommendations for HDMI 2.1 cables that aren't too expensive.

They had a few follow up videos, and one on DisplayPort cables.

View: https://www.youtube.com/watch?v=XFbJD6RE4EY

 

[adaysep91]

I recommend watching the recent videos by Linus Tech Tips and their Totalphase cable tester. Surprising results when they tested all the cables they had and then some.

They had a few brand recommendations for HDMI 2.1 cables that aren't too expensive.

They had a few follow up videos, and one on DisplayPort cables.

View: https://www.youtube.com/watch?v=XFbJD6RE4EY

thank you very much for the advice, I will look into it.

 

[Darkbreeze]

Nice guys. Thanks for helping the guy out.

 

[adaysep91]

Greetings to all. I finally replaced the cable and it seems to have fixed the problem. I've been running the screen in 4K and 120 hz for a while now, plus 10 bit color depth, and no problems or black flickering.

Thanks to all who have helped on this post. Regards

https://ibb.co/2jmcgHM

 

[sizzling]

Greetings to all. I finally replaced the cable and it seems to have fixed the problem. I've been running the screen in 4K and 120 hz for a while now, plus 10 bit color depth, and no problems or black flickering.

Thanks to all who have helped on this post. Regards

https://ibb.co/2jmcgHM

Glad you got it sorted

 

[gamerk316]

Yeah, kind of figured it was the cable. I don't know how HDMI Forum is doing their certification, but a LOT of cables have had issues with HDMI 2.1.

As for why the old cable worked at 4k120 on a 5700, HDMI 2.0 can barely pull it off, albeit at 8bpc with 4:2:0 chroma. Not sure how AMD handles chroma when you try and select 4k120, but it's possible the drivers simply reduced the chroma to fit in HDMI 2.0 bandwidth limitations. So the cable appeared working even though it couldn't supply HDMI 2.1 bandwidth. That's the best guess I've got anyways.

Regardless, a screen that occasionally blanks is generally the cable not being able to meet the necessary bandwidth.

 

[Rogue Leader]

Yeah, kind of figured it was the cable. I don't know how HDMI Forum is doing their certification, but a LOT of cables have had issues with HDMI 2.1.

As for why the old cable worked at 4k120 on a 5700, HDMI 2.0 can barely pull it off, albeit at 8bpc with 4:2:0 chroma. Not sure how AMD handles chroma when you try and select 4k120, but it's possible the drivers simply reduced the chroma to fit in HDMI 2.0 bandwidth limitations. So the cable appeared working even though it couldn't supply HDMI 2.1 bandwidth. That's the best guess I've got anyways.

Regardless, a screen that occasionally blanks is generally the cable not being able to meet the necessary bandwidth.

Although his computer was telling him he was setting it to 4k/120, No 5700XT supports 4k/120 out of HDMI, they are limited to 4k/60.

 

[gamerk316]

Although his computer was telling him he was setting it to 4k/120, No 5700XT supports 4k/120 out of HDMI, they are limited to 4k/60.

It's an HDMI 2.0 card, so it should be able to output 4k120 8bpc @ 4:2:0; it fits within HDMI 2.0's bandwidth limits:

https://en.wikipedia.org/wiki/HDMI#Refresh_frequency_limits_for_standard_video

Likewise, the Displayport ports are rated as version 1.4 so it should also be able to handle 4k120 8bpc @ 4:4:4

https://en.wikipedia.org/wiki/DisplayPort#Refresh_frequency_limits_for_standard_video

Now, I can't find a spec sheet for the card itself (really AMD?), but I'd be surprised if the card were outright incapable of outputting a resolution that is supported by the output in either mode. If my 1080Ti can output 4k120, there's no excuse why the 5700 XT couldn't.

 

[Rogue Leader]

It's an HDMI 2.0 card, so it should be able to output 4k120 8bpc @ 4:2:0; it fits within HDMI 2.0's bandwidth limits:

https://en.wikipedia.org/wiki/HDMI#Refresh_frequency_limits_for_standard_video

Likewise, the Displayport ports are rated as version 1.4 so it should also be able to handle 4k120 8bpc @ 4:4:4

https://en.wikipedia.org/wiki/DisplayPort#Refresh_frequency_limits_for_standard_video

Now, I can't find a spec sheet for the card itself (really AMD?), but I'd be surprised if the card were outright incapable of outputting a resolution that is supported by the output in either mode. If my 1080Ti can output 4k120, there's no excuse why the 5700 XT couldn't.

Check the specs on any RX 5700XT, the ones that spell it out all state the port only supports 4k/60. Displayport on the card will do it.

Example:
https://www.sapphiretech.com/en/consumer/nitro-radeon-rx-5700-xt-8g-gddr6