LG 48CX OLED - 4K 120 Hz

I should have a 65CX arriving today. For those guys running this screen with a 30 series GPU successfully @ 4K 120Hz 4:4:4 10 bit, would you mind posting which HDMI 2.1 cable you're using?
 
R3X said:
I own the 48CX and also 800 mm deep desk, 48CX imo is far too big for a daily monitor use, it's ridiculously big. I feel you would need 1.2-1.5+m distance between you and the screen to be in the sweet spot zone, even I sit back due to long arms, so I am actually sitting far back from my CX screen probably 1.2metre back and its still too big for me.
Click to expand...
Are you talking about from a productivity or gaming perspective? From a productivity perspective, I develop software for a living and really value being able to have a couple of projects open side by side and also a web browser window or two. So I'm thinking of installing some software that allows me to split the screen into multiple zones. In that way, I'll be able to be productive without having any single window using up the whole screen, and in that sense, I'll use the whole screen real estate. For games though, I get it that 48" and even more so 55" up close is a bit large, especially for things like FPS games. To mitigate this issue, for games where I could use a controller, I have a sofa behind a few feet behind my desk chair, so I have the option to sit on that to play games, in which case, I'll be about 3m away from the screen.

R3X said:
I use free flux software or Windows night light for quicker control from bright to dark (contrast zones) otherwise my eyeballs would fall out.
Click to expand...
That's a nice idea, I'll look out for that.

R3X said:
Text is super sharp and clear on the LG CX panels but the key is to get RBG 4.4.4, this allows text to be sharper and detailed.
Click to expand...
Excellent, that puts my mind at rest, I was really worried about text clarity.

R3X said:
One way to test this, get 2 pieces of cardboard or join up some cardboard boxes with tape and make them to the same dimensions (height and width) of a LG 48CX and LG 55CX and then use drawing pins to pin them onto the wall and just sit back for a few minutes, it gives you a very rough idea of the magnitude of the screen size but its one of those things sadly you would only be 100% sure with the screen in front of you. You got the right idea of Wall mount ( I did this)
you don't want stands or anything to take up space, Wall mount is superior in creating distance between you and the screen, get a wall mount which is as flat and close to wall as possible.
Click to expand...

That's a nice idea. Although I've not done it with cardboard as you suggested, I have just traced out both 55" and 48" and, well, yeah, the 48" is pretty big as it is and although it doesn't have the width and horizontal real estate of the G9, it has height and I can see how it could be considered as too much height. If I went for the 55", then even though I love having screen space, I think it could be fatiguing to keep having to look to the top of the screen to see windows in the top half, so I'd probably not use the very top part of the screen for productivity use, which might make it less effective vs the 48" CX.

Doing the measuring though made me realise that if I go for the 55" over the 48", something is going to have to give. My desk is not wide enough to hold a 55" CX, plus my desk top speakers (which I only recently built and love), plus my PC case (Fractal Define 7XL). I can't put my PC case under the desk, due to not having the room because I already have a Wheel Stand Pro under there with my HOTAS set up on it and have nowhere else to put it. Besides, from a dust perspective, I'd rather the computer be off the ground. So desk width (1600mm), minus computer case width (240mm), minus two speakers (each needing around 140mm in width) leaves 1080mm, which is perfect for the 48" CX, but too small for the 55" CX. So unless I come up with an alternate solution, I think I might be size limited to a 48" CX.

R3X said:
55CX would be ideal, think it was going for 1.2k 3 days ago but bumped up now, JL use Domestic and General for their insurance and TV repairs so even if JL go bust D&G will keep ticking. Any doubt of burn in go JL insurance, its only £140 I did. 48CX probably won't drop in price on Black Friday its rare and pretty much out of stock everywhere, JL were doing free ear phones and £100 gift card last week but offers change weekly maybe that can help off set some of the ££ for you.
Click to expand...
Ah that's a good point about the insurance. Given my possible size contraints, I'm not kicking myself too much that I missed the 55" at that price, but that was a really good price. I think you are right that it is unlikely that the 48" will go on sale over Black Friday, but since I'm not in an urgent rush, I'm going to wait and see just in case.

MarkA said:
It is just the size really.
Click to expand...
Perfect, thanks.
 
Marak said:
The boat of accuracy and truth?

You just confirmed exactly what I said and what everyone here knew all along - that you can do 4k 120Hz but only at 4:2:0. But you're acting like you possess some forbidden knowledge the rest of us don't already know and then mocking people who bought 3090's because they "don't need" them to do 4k 120Hz...

You can't do what we who have the 3070/80/90 can do:- 4k 120Hz 10-bit HDR G-Sync in RGB or 4:4:4 Chroma Only a card with HDMI2.1 can do that on the LG CX.
Click to expand...

I didn't say I possess any special forbidden knowledge, I have been around a PC for along time when Intel 386 hit the market, until now 10gen CPUs most members here have more knowledge then me we all build custom PC and I didn't say my GPU Pascal have G-sync because it don't you can get 8bit with 4.4.4 in RGB and 4.2.0 is still good unless you have blue/red text highlighted then it unreadable, you know that senses very well " You can't do what we who have the 3070/80/90 can do" I remember when fans back in the days said the same on Geforce FX - 10, 16, 20 now 30 Series cards who cares!! 20% extra performances is not allot in Nvidia cards from the last gen cards, but still the fans will make an argument about it because they know best right!!

A few thinks that 2.1 is new in fact it came out in 2017 and HDMI/DP was only 60hz but that changed DisplayPort 2.0 will top out at 80 Gbps of raw bandwidth, about 2.5 times that of DisplayPort 1.3/1.4 over HDMI 2.1 48Gbps and on the 30 series cards is still only have the 1.4a DP like the 1080, how will you get DP 2.0! DisplayPort 2.0 came out in 2019 but I didn't see it on LG OLED only HDMI and Nvidia didn't add it in there new 30 series cards Why.

The fact is 2.0/a/b is 18Gbps 2.1 is 48Gbps =30 Gbps more than the last gen but DP 2.0 will be 32Gbps more then 48Gbps
 
Last edited:
D3lirious said:
I should have a 65CX arriving today. For those guys running this screen with a 30 series GPU successfully @ 4K 120Hz 4:4:4 10 bit, would you mind posting which HDMI 2.1 cable you're using?
Click to expand...

Congratulations on your CX65:D:D you got the biggest TV here

that would be a difficult question some will clam they can see the differences from expensive cables IMO anything over £20.00 is best anything lower to the cheap end forget:D But it's your choice
 
Last edited:
Andrew Macgregor said:
Are you talking about from a productivity or gaming perspective? From a productivity perspective, I develop software for a living and really value being able to have a couple of projects open side by side and also a web browser window or two. So I'm thinking of installing some software that allows me to split the screen into multiple zones. In that way, I'll be able to be productive without having any single window using up the whole screen, and in that sense, I'll use the whole screen real estate. For games though, I get it that 48" and even more so 55" up close is a bit large, especially for things like FPS games. To mitigate this issue, for games where I could use a controller, I have a sofa behind a few feet behind my desk chair, so I have the option to sit on that to play games, in which case, I'll be about 3m away from the screen.


That's a nice idea, I'll look out for that.


Excellent, that puts my mind at rest, I was really worried about text clarity.



That's a nice idea. Although I've not done it with cardboard as you suggested, I have just traced out both 55" and 48" and, well, yeah, the 48" is pretty big as it is and although it doesn't have the width and horizontal real estate of the G9, it has height and I can see how it could be considered as too much height. If I went for the 55", then even though I love having screen space, I think it could be fatiguing to keep having to look to the top of the screen to see windows in the top half, so I'd probably not use the very top part of the screen for productivity use, which might make it less effective vs the 48" CX.

Doing the measuring though made me realise that if I go for the 55" over the 48", something is going to have to give. My desk is not wide enough to hold a 55" CX, plus my desk top speakers (which I only recently built and love), plus my PC case (Fractal Define 7XL). I can't put my PC case under the desk, due to not having the room because I already have a Wheel Stand Pro under there with my HOTAS set up on it and have nowhere else to put it. Besides, from a dust perspective, I'd rather the computer be off the ground. So desk width (1600mm), minus computer case width (240mm), minus two speakers (each needing around 140mm in width) leaves 1080mm, which is perfect for the 48" CX, but too small for the 55" CX. So unless I come up with an alternate solution, I think I might be size limited to a 48" CX.


Ah that's a good point about the insurance. Given my possible size contraints, I'm not kicking myself too much that I missed the 55" at that price, but that was a really good price. I think you are right that it is unlikely that the 48" will go on sale over Black Friday, but since I'm not in an urgent rush, I'm going to wait and see just in case.


Perfect, thanks.
Click to expand...


Productivity or gaming perspective is a good question, I was more discussing in terms of gaming but productivity does change things possibly although I don't do my work on the 48cx I do double it up with multiple browser windows or Ytube screens sometimes while researching hardware/tech on forums and ytube site and it's actually good for that simply due to the extra real estate screen space, so gut instincts say if you are doing productivity and for work purposes the 48cx or 55cx may help out you more.

3 metres is good, I am roughly 3 metres for watching films and its nice you are not too far away and not too close, so you can enjoy the sharp detail and enjoy blacks, colours and viewing angle much better.

If you can wait for sure its worth it, might get lucky with some better discounts down the road.

I think Curries still has the better stock for 48CX due to their LG promo deal and partnership in the past, they also have an excellent automated booking system over the phone when booking in and sorting out repairs on LG OLEDs as in they don't mess customers around too much, sadly not as good as JLs D&G burn proof insurance, I like peace of mind though but burn in should be almost a myth at this point.
 
D3lirious said:
I should have a 65CX arriving today. For those guys running this screen with a 30 series GPU successfully @ 4K 120Hz 4:4:4 10 bit, would you mind posting which HDMI 2.1 cable you're using?
Click to expand...

I am currently using this Club 3D HDMI cable which works perfectly although it is a little pricey.

https://www.club-3d.com/en/detail/2...k60hz_certified_cable_48gbps_m-m_2_m-6.56_ft/

I also have a the True HQ HDMI cable which Vincent from HDTV test recommended buying as he used this one to fix his flicker and blackout issues.

https://www.youtube.com/watch?v=w0a_GQ-Ze-8
 
Gino Giori said:
The problem using only the tv as a monitor, is that one would need a monitor next to the tv, to ensure the TV does not drift too far away from sRGB. I do quite a a lot post production in photoshop and am curious to see if this tv can get close to sRGB. So far, none of the gaming monitors I have tried have been accurate. The only accurate monitors are the professional monitors. I am curious what a tv will do.
Click to expand...

It has excellent color reproduction. You'll need to calibrate the monitor to get it there though.
 
Andrew Macgregor said:
I've had two attempts at an Odyssey G9. I'll admit, I absolutely love that monitor, but both attempts have had issues ranging from bezel blead and dead pixels to scan line issues and bad flickering. Although I love the G9, given how many of them are having issues, I'm getting cold feet about going for a further attempt to get a good one. So, I'm now considering either trying a CX OLED or a 38" LG ultrawide, but before I make a decision, I have a number of questions in priority order regarding the CX:
  • Has anyone tried it as a full time PC monitor (without any other monitor) for work (~10h per day) and play and noticed any signs of permanent image retention? Is going for a CX with this use case a bad idea? Or are the suggestions that I've noticed people making for monitor use good enough? Things like:
    • setting it at 45% brightness to help reduce the risk of burn in. At 45% is that really dark or still reasonably bright?
    • setting the contrast lower (60), again to lower the risk of burn in
  • What is text sharpness like when the HDMI is set to PC mode? Is it perfectly clear? Or if not, at least as good as a 1440p monitor?
  • I have an RTX2080, so realise that I won't be able to do 4k@120Hz with VRR since it doesn't have HDMI 2.1, but will an RTX2080 be able to do 1440p@120Hz with VRR over HDMI?
This may sound a stupid idea (feel free to chip in if you think it is), but I realise that a 48" is probably the better size to go for, but I'm considering a 55" with this logic - my desk is 800mm deep, if I hang the screen on the wall then I'd be sitting 90-100cm away from it for desktop use, which although isn't ideal, is hopefully far enough away to be manageable. For games, I have a sofa directly behind my desk chair, so if playing games, I could always sit on the sofa, either that or I could play in window'd mode for games that support that. So why 55" you may be asking? It is purely to do with this backout plan - if, for some reason I don't get on with the OLED as a monitor, then I could put it in the lounge as the family TV (my current TV down stairs is a really old 40" Sony Bravia 40W4000 that is still going strong, but a larger TV wouldn't go amiss). That said, primarily my hope is that I will like it as a monitor, so if I go for a 55", it would be really sad if my only gripe was that I'd wished that I'd gone for a 48".
Click to expand...

1. The CX is too new for people to have much experience with burn in. It takes a couple years before burn in starts to show up. This model has a lot of anti burn in tricks, and hopefully it's improved enough over prior models that we will have less problems. But we won't know for sure until a couple years at least. I recommend waiting for John Lewis to go in stock and get the 5 year protect plus, which covers burn in, if you're going to use it for productivity work.

2. Yes, take precautions against burn in. Use dark mode in your browser, auto hide your task bar and use transparent mods to make it invisible. Changing contrast doesn't do anything to help, however reducing luminence (OLED brightness setting) will. For SDR content it is far too bright anyways out of the box - I set it anywhere from 20-30 without an issue. Apart from those things you should be good. Brightness of 28 is 100 cd/m, 36 is 120 I believe, so plenty bright in my opinion.

3. Text sharpness is 92 PPI for 48". If you want to use it as a PC monitor do not go bigger than 48, because a PPI below 90 is pretty horrible (if you ever used a 27" 1080p monitors you know what it is like). 1440p 27" will have higher PPI and so text will look sharper (and smaller) in comparison. The 48CX is basically the same as a 24" 1080p in terms of fonts. I think that it is fine, although I would like it if the screen was a bit smaller (e.g. 42") with higher PPI.

4. The main con I think for productivity usage is the glossy screen. It's nowhere as bad as the old Apple cinema displays, but if your room is very bright it will be annoying I think. You can crank up the brigthness to combat it.

5. It's very important you get 4:4:4 chroma so fonts look good. That means on a 2080 you will have to run at 60Hz. Only nvidia 3000 series supports 4:4:4 at 120hz using HDMI 2.1.

6,. Your 2080 will work at 120hz in games but the chroma reduction will cause color issues. What people do successfully is just run at a lower res like 1440p so you get full chroma. The LG has excellent scaling so it should look good still. Then save up for a 3000 series.

I'll reiterate that getting a 55" for productivity/PC monitor use would be a huge mistake in my opinion. Only get that size if you're just going to be gaming or watching content on it. The PPI is just too low. The 48" is perfect for it since the PPI means you can sit about 60-80cm and it's perfectly usable. It's like having 3 30" monitors in portrait mode next to each other.

I think the LG is amazing and you won't regret it.
 
Last edited:
nvarsj said:
I'll reiterate that getting a 55" for productivity/PC monitor use would be a huge mistake in my opinion. Only get that size if you're just going to be gaming or watching content on it. The PPI is just too low. The 48" is perfect for it since the PPI means you can sit about 60-80cm and it's perfectly usable. It's like having 3 30" monitors in portrait mode next to each other. I think the LG is amazing and you won't regret it.
Click to expand...

Lets talk about PPI.
The PPI it may be greater but the immersion is reduced, it is like the 48" model with the highest 92.5 PPI - 36PPCM but is that better? Not if you sit at regular distance to the tv No, I don't think it is the CX 55 is 80.6 PPI -31 PPCM and the CX 65 is 68PPI -26PPCM On the CX 48 the OLED Light Max and Contrast Max Brightness 50 Sharpness 10 Colour 55 when playing HDR games and sitting only 60-80cm! in a darkroom it will cause eye strain but that also depends on the depth of your desk and if use of a game pad, the CX48 is a nice display but it's not like a PC 1080p 27-32inch LCD Monitor it's an 4K OLED TV panel but that's your choice:D
 
Last edited:
New 65CX mainly set up now. Coming from a Samsung Q900 75" 8K so had to sacrifice some size. I was having all kinds of issues with HDMI 2.1 on the Samsung (hand shake issues, flickering, missing 120Hz options, etc) so it's nice to plug this screen in and get 4K 120Hz RGB HDR gsync all working at once!

I'm still trying to get my head round the settings menus, but getting there.

One thing I've noticed, I don't seem to be able to select anything other than 2 channel in sound settings. i have PC connected to HDMI 1 and HDMI 2 connected to AVR. The AVR is a Marantz 7012, so isn't HDMI 2.1 but does support EARC, so assumed this would just work. I have EARC enabled in the TV settings and have tried both bitstream and PCM output on HDMI 1 (PC) with no luck.

Just need to try out some games now.
 
You must log in or register to reply here.
Back
Top Bottom