Thanks for sharing, I am about to buy a CX series myself

So I just got my LG OLED48CX and a 40 foot HDMI optical cable. I can get everything to "turn on" (HDR, 120 hz, gsync) but the TV constantly flickers on and off. I tried every option I could think of (on the TV and in the Nvidia control panel) but no dice. I'm guessing it's the cable at this point. I have another cable (6 feet) showing up today. I'll give that a shot and hopefully that works.
 
FYI, below is the cable I'm using.
https://smile.amazon.com/gp/product/B081SF1DKF/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1
 

You have to update the firmware on the TV....

Also: that’s a crappy Chinese knockoff cable if I’ve ever seen one. Find one that’s actually high quality. Buying cables off of Amazon for these purposes is a no-no.

Get the Monster 8K hdmi cable from Walmart $44 for 15-FTW3, and there is a longer one too. most likely it is the cable, makes huge difference.  I had a few high quality cables and none worked.
 
 

I also have the 48 inch CX and I am waiting for the 3090 :|.
 
As for any issues with the TV and Gsync and flickering... LG is aware of it and working on a firmware to fix it, they released a beta firmware that they released to a few people to try it and hopefully soon, it will be released to the public!
 
Vincent from HDTVTest made a video on it.
 
https://www.youtube.com/watch?v=0lYgrlQqds0
 

kring

1. You may need to cut out a rear slot divider or it blocks airflow (some other cards needed this)

I'm spoiled by the 400a, I love that I can take them all out and have a huge hole to work with there with no thin bars blocking anything.

So I switched to a shorter 8k cable and the flickering was still there but disabling "Instant Game Response" stopped the flickering. However, I can't get the monitor to work with g-sync. I also updated the firmware, but that didn't seem to help.
 

kring
Get the Monster 8K hdmi cable from Walmart $44 for 15-FTW3, and there is a longer one too. most likely it is the cable, makes huge difference.  I had a few high quality cables and none worked.

I just bought a 15 and a 75 foot monster 8k optical hdmi cable. The 15 footer should be here on Friday, and the 75 footer should be here early next week. I'll report back with what I find.
 

basicallyevolve
I also have the 48 inch CX and I am waiting for the 3090 :|.
 
As for any issues with the TV and Gsync and flickering... LG is aware of it and working on a firmware to fix it, they released a beta firmware that they released to a few people to try it and hopefully soon, it will be released to the public!
 
Vincent from HDTVTest made a video on it.
 
https://www.youtube.com/watch?v=0lYgrlQqds0

Thanks for sharing this video. This seems to be my exact problem. Hopefully I won't have the problem with the monster cables I have coming, but I'll be looking forward to the firmware update. I really wish there was some way I could get the beta version of the firmware like what the guy in the video has.

So it looks like turning off "Instant Game Response" mode disables g-sync. So... I'm really looking forward to that firmware update.

The new firmware update is out, I installed and seems fine but I won't have time for testing.  it works for US, but not EU.  If anyone wants to check but be cautious that it's probably beta and not widely available yet.
 
 

kring
The new firmware update is out, I installed and seems fine but I won't have time for testing.  it works for US, but not EU.  If anyone wants to check but be cautious that it's probably beta and not widely available yet.
 
 

NICE! I'm downloading it now and will report back.