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AnsweredHot!3090 FTW3 Ultra - Experience & Tips (for LG CX OLED users)

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thefinalhope
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/09/28 21:01:14 (permalink)
Thanks for sharing, I am about to buy a CX series myself
#31
aldur80
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/09/29 13:42:38 (permalink)
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
 
#32
HawkOculus
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/09/29 13:48:35 (permalink)
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.
#33
kring
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/09/29 21:02:43 (permalink)
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.
 
 
#34
basicallyevolve
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/09/29 21:32:13 (permalink)
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
 

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#35
yaggaz
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Re: 3090 FTW3 Ultra - Experience & Tips (for LG CX OLED users) 2020/09/29 21:46:06 (permalink)
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.

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aldur80
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/09/30 06:39:30 (permalink)
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.
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aldur80
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/09/30 07:29:27 (permalink)
So it looks like turning off "Instant Game Response" mode disables g-sync. So... I'm really looking forward to that firmware update.
#38
kring
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/09/30 10:52:30 (permalink) ☄ Helpfulby Cool GTX 2020/09/30 12:34:03
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.
 
 

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#39
aldur80
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/09/30 10:58:03 (permalink)
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.
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aldur80
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/09/30 12:03:30 (permalink)
Just installed the update and a quick 5 min test shows that it works great. Flickering is gone and g-sync is working great. The long cable I have still doesn't work, but the short cable works great. Looking forward to trying the monster cables I have coming.
#41
aldur80
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Re: 3090 FTW3 Ultra - Experience & Tips (for LG CX OLED users) 2020/09/30 12:19:17 (permalink)
kring
... NVIDIA color settings and choose 32-bit, 10 bpc, yCbCr444, Limited.


So, I might be missing something, but isn't the signal coming from a PC in RGB, so wouldn't it make sense to use RGB Full instead of yCbCr444 Limited?
post edited by aldur80 - 2020/09/30 20:18:17
#42
aldur80
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Re: 3090 FTW3 Ultra - Experience & Tips (for LG CX OLED users) 2020/10/02 09:15:50 (permalink)
kring
HDMI cable needs to be 8K 48gbs supported or you will get issues.  Windows looks fine but stuck at 60hz, some games crap out i.e. RDR2 when maxed.  These are actually really hard to find. I went with one from Walmart - Monster 8K 15ft 48gbs platinum fiber optic HDMI for $45.00.  the generic brands on amazon & ebay are probably crap knock offs. None of the other big box stores carry any 8K cables.
 


I picked up that exact 15 foot monster cable from walmart. When I use the cable the monitor flashes like crazy when "instant game response" (which is needed for g-sync) is turned on.
 
Only thing that has worked for me so far is a cheap 6 foot non-optical cable I got from Amazon. I just ordered a $230 monoprice cable that I'll get next week.
#43
aman4672
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/10/02 20:15:16 (permalink)
what do you mean by "You may need to cut out a rear slot divider or it blocks airflow (some other cards needed this)" I am not really understanding?
#44
arestavo
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/10/03 16:42:45 (permalink)
The 65" LG CX (US) model doesn't have the firmware available via the updater for that G-Sync black flashing issue at 4K 120Hz (Chroma 4:4:4, RGB, 10 or 12 bit, it didn't matter). I don't think I want to try that beta firmware listed on Reddit since it looks to be specifically for the CX 48". OLED looks great, but the CX really doesn't like nearly all white screens and dims enough to be extremely noticeable (can't be turned off apparently). Still, even without G-Sync on at 120Hz 4K RGB 12 bit (yes I know that it's a 10 bit panel) looks sexy.
 
Now, just need that G-Sync firmware update on the CX to NOT have that flashing black screen.

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Straykatt
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/10/03 17:35:24 (permalink)
Its definitely not as bright as an lcd but its much better, ensure you have the oled set 100 and turn off energy saver and use high for peak brightness. 
#46
arestavo
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/10/03 18:09:33 (permalink)
Straykatt
Its definitely not as bright as an lcd but its much better, ensure you have the oled set 100 and turn off energy saver and use high for peak brightness. 


Thanks! I'll make sure that is set.
 
And speak of the devil! My CX just got a 03.10.41 update and 4K 120Hz with G-Sync on doesn't flicker!

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#47
aldur80
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/10/03 18:36:56 (permalink)
Straykatt
Its definitely not as bright as an lcd but its much better, ensure you have the oled set 100 and turn off energy saver and use high for peak brightness. 

Turning off the automatic brightness limiter helps a lot here.
#48
Mr.Gisoid
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/10/03 19:29:12 (permalink) ☼ Best Answerby kring 2020/10/03 21:01:29
#49
kring
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/10/03 20:31:35 (permalink)
aman4672
what do you mean by "You may need to cut out a rear slot divider or it blocks airflow (some other cards needed this)" I am not really understanding?


So on the back back of your computer where the video cards Hdmi & dispay ports are located, some cases are all single slots, but the 30XX series cards are all duel slot, So you may need to cut the back of the case to make it work for a duel Slot card. Otherwise you will have a strip of metal covering the cards rear exhaust which is not good for cooling.
#50
Shield Wulf
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/10/03 20:35:40 (permalink)
I think you need an 8K rated cable to get 4K 120 hz.
#51
arestavo
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/10/03 22:33:48 (permalink)
Dang - firmware 03.10.41 on my 65" CX still has an occasional black screen flicker spurt while crunching work units for Folding @ Home with G-Sync on. (4K 120Hz RGB 10bit Full, for those interested)

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#52
Straykatt
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/10/03 22:48:22 (permalink)
That’s not the recent update
#53
arestavo
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/10/04 21:59:41 (permalink)
Straykatt
That’s not the recent update

Found the beta firmware works on the 65" CX as well, installed and all is well so far.

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#54
aldur80
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/10/07 12:54:10 (permalink)
For a cable I ended up going with a monoprice 8k 120 hz cable as it was the only long (30 foot) cable that get to work with this GPU and TV.
 
https://smile.amazon.com/gp/product/B07Y2DS1JV/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
 
It's expensive but it's worth it.
post edited by aldur80 - 2020/10/07 13:52:35
#55
Veratu
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/10/14 23:46:24 (permalink)
Just to chime in here, your recommended settings are not actually ideal, specifically these lines:
 
--
  1. For LG CX OLEDs (I have 48") you MUST go into WIN 10 advanced display settings and set resolution to 3840 x 2160, you also have to set the monitor Refresh to 120hz (defaults to 30), and enable HDR, Enable Variable refresh rate, enable hardware-accelerated GPU scheduling...  It's amazing none of this is on by default or auto-detected.  would be nice if LG offered a driver!
  2. For LG CX OLEDs, in Nvidia control panel, choose Change resolution, in section 2 - choose a resolution of "PC"  3840 x 2160, 120hz refresh. Section 3, override to NVIDIA color settings and choose 32-bit, 10 bpc, yCbCr444, Limited. and apply"
--
 
You don't have to do anything in line 1 except enable HDR, the rest will be overridden or changed by the NVidia driver once you start setting the options in line 2.
 
Also, don't use yCbCr444, the native color pattern for LCD/OLED is RGB for PC use, you're essentially putting more work on the card / system by forcing it to send a yCbCr444 signal only to be converted back to RGB by the display.  You should set it to:  32bit, 10bpc, RGB, Full.
 
It's also a good idea to set your input to PC mode, this can be done by going into the Home Dashboard, highlight the HDMI input, then selecting the settings in the top right (Press the green button), scroll down to the icon next to the label for the input, select the icon and change it to the PC icon, this will change that input to PC mode which will automatically adjust many of the picture settings for PC use.
 
Lastly and most importantly you MUST be on LG Firmware version 3.11.25 or higher for any of this to work as G-Sync and Subchroma don't work properly on prior versions with the 3x series cards.  3.11.25 isn't rolled out broadly yet so if you want it you have to install it manually (currently).  The Korean and US firmwares are the same, the Korean LG site has the firmware available for download, if you google the 3.11.25 LG CX firmware download you'll find a few places with direct links to it.
 
Once this is setup the LG and 3x series really shines... the display quality and output is truly fantastic.  Don't spend ridiculous amounts of money on HDMI cables, it's a digital signal as long as it's rated for the proper bandwidth with the right pins and gauge of wire it'll likely be just fine.  I personally use the Monoprice DynamicView Ultra 8K Premium High Speed HDMI Cable, 48Gbps, 8K, Dynamic HDR, eARC cable, the 6ft version costs a whopping $14 and it's perfect.  I use these on all 9 of the OLEDS in my house and they test solid for every video, bandwidth, and chroma test I've done so far.
 
If you want to check your signal from the card (quick and dirty), just press the green button on your magic remote a bunch of times and you'll get a Freesync overlay window that tells you your current signal.  (You want to see VRR, 3840x2160P at 120, RGB 10b 4L10) The Hz will change depending on your content.  The key here is you want to see 3840x2160P  NOT  3840x2160I or 4096x2160I.  You want progressive mode not interlaced mode.
 
There are cases where doing a Nvidia driver upgrade from an earlier version is causing issues here, (it happened to me too), the only way I could fix it was to do a full driver uninstall, reboot into safe mode and do a driver clean (while disconnected from the internet so Microsoft doesn't auto install the driver on reboot), then once back up I installed the latest driver and all of the options worked correctly, then I reconnected back to the internet and everything is happy.  (This is a last resort if you can't get your resolution to set properly with all of the noted things above).
 
If you want the more advanced version with full diagnostics, go into the TV settings menu, scroll down to the Channels tab, highlight the first option (Channel Tuning for US versions of the TV), then press 1 5 times (ie: 11111) that will bring up the host diagnostics screen.  From there scroll over to the HDMI mode, and hit Ok, this will bring up the full HDMI signal information screen.
 
Enjoy!
post edited by Veratu - 2020/10/14 23:53:51
#56
Straykatt
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/10/15 00:15:04 (permalink)
Thank you for these useful tips! What are your thoughts regarding using Gsync with Vsync? A lot of people recommend using these two together but my understanding you only use Gsync. Apparently users saying you still get tearing and the only way to get no tearing is to use vsync also. Are you experiencing the bug with frames higher than 110 with gsync on? There’s a lot of users on avsforums getting this and has been escalated to LG and they said they’re aware and working on the firmware fix. Lastly I see how using pc mode does make it a little smother but using pc mode I’m not able to use dynamic contrast in pc mode and I think it looks better with it on so I leave it in hdmi mode.

Do you know why you can’t use Dolby vision in 4K 120 at 4:4:4? People are saying you have to pick either one or the other, can’t have both on at the same time?
post edited by Straykatt - 2020/10/15 00:17:18
#57
aldur80
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/10/15 08:27:25 (permalink)
Veratu
Once this is setup the LG and 3x series really shines... the display quality and output is truly fantastic.  Don't spend ridiculous amounts of money on HDMI cables, it's a digital signal as long as it's rated for the proper bandwidth with the right pins and gauge of wire it'll likely be just fine.  I personally use the Monoprice DynamicView Ultra 8K Premium High Speed HDMI Cable, 48Gbps, 8K, Dynamic HDR, eARC cable, the 6ft version costs a whopping $14 and it's perfect.  I use these on all 9 of the OLEDS in my house and they test solid for every video, bandwidth, and chroma test I've done so far.


I agree with everything you said except about the cables. There are so many cables on Amazon that says they are 8k 60hz 48 Gbps and they don't work for me. I went through around 10 cables before I found one that actually works. You have to go with a decent brand, like what you did with Monoprice. Although I needed a really long cable and you're more than likely to find a cable that works if it's a short cable. I finally settled on a 30 foot optical HDMI 8k/120 Monoprice cable that was dang expensive, but it actually works.
#58
TheLamonster
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/10/15 09:30:07 (permalink)
I just installed my 3090 and adjusted most of the settings in the OP.  However, my desktop icons are slightly cut off on the left side.  For example, my control panel shortcut says "ontrol Panel"
 
I have "no scaling, scale on display" already set, and my LG CX TV is set at 16:9 and justscan is on and greyed out.  Any advice?
 
 
edit: installing 3.11.25 resolved it...or maybe it was just that the TV was restarted during the update.  
post edited by TheLamonster - 2020/10/15 09:41:10
#59
notarjy
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Re: 3090 FTW3 Ultra - Experience & Tips 2020/10/15 09:50:17 (permalink)
I have an LG E9 and 3080 ftw3 ultra, I spoke with LG customer support chat yesterday and gave them my info to receive the G sync fix update. They needed my serial number and wired mac address. For now leaving G sync off, everything else works flawlessly.

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#60
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