Question 4k@120Hz flickering

[gabecz]

Hi
RTX3070 and 65QN90D TV here. I so far have found only one cable in the house (I have boxes full of them) that wants to let me go up to 120Hz, and even that flickers every now and then. And flickering I mean colors shift and back within a fraction of a second.
Is that because the cable is not 4k120hz ready? The sign on it says High Speed not Ultra High Speed. not too long though. Are those 20ft long cables claiming to be able to handle 120Hz on 4k true/real? I'd prefer not to spend more than 20 bucks on the cable to be honest.
Any suggestions? I have seen "fancy" / quality looking ones for $25-$27 dollars. Which if you all say is the one I need I'm ready to buy.
Thanks for suggestions

 

[beyondlogic]

Hi
RTX3070 and 65QN90D TV here. I so far have found only one cable in the house (I have boxes full of them) that wants to let me go up to 120Hz, and even that flickers every now and then. And flickering I mean colors shift and back within a fraction of a second.
Is that because the cable is not 4k120hz ready? The sign on it says High Speed not Ultra High Speed. not too long though. Are those 20ft long cables claiming to be able to handle 120Hz on 4k true/real? I'd prefer not to spend more than 20 bucks on the cable to be honest.
Any suggestions? I have seen "fancy" / quality looking ones for $25-$27 dollars. Which if you all say is the one I need I'm ready to buy.
Thanks for suggestions

View: https://www.youtube.com/watch?v=clvAs9FEg_g


try diagnosing with this youtube video also check other hdmi slots on back as it may be a dodgy hdmi

 

[Glenwing]

High Speed HDMI is not tested up to those speeds.