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Everyone knows that it works on the OLEDs with HDMI 2.1. No one is clarifying whether the CX renders 4K 120 Hz at 4:4:4. All evidence shows that it downsamples to 4:2:2, and the C9 doesn't have this issue.
 

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not sure what im stepping into kurian, why would a cx down sample to 4:2:2, that seems to defy logic.
also what evidence?

hanging to crack 4k 120 hz...
 

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Hey guys, just wondering if these are the correct settings for gaming on PC at 1440P 120hz, I have the HDMI label as PC but not sure what Output Colour format and Output dynamic range to use, it looks great as is when gaming but just wanna make sure I’ve got it looking it’s best.
This may be fine for SDR, but will cause HDR dithering and I would advise YUV422 10-bit Limited to send the full color data to your TV. Also if you do this, don't label your input 'PC'. Most HDR supported games are developed with 422 or 420 color in mind for console compatibility anyway, so RGB/YUV444 won't achieve anything.
 

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LG CX 65” OLED | Samsung HW-N950 | Sony X800M2 | Xbox One X | PS4 Pro | Sony XBR-65x930e
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Was able to secure a PS5 preorder, gotta work on the Series X next week and will be all set. Excited to see how all this stuff works together. Crossing fingers that it works well 😂
 

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Yea ALLM is pretty awesome, I never switch to game mode anymore. Have not seen any graphical issues on my end with Xbox One X outside game mode. Response seems just as good to me playing PUBG and etc. HGIG may be more important in the next gen, we will see and I’m not sure the general consumer will even care or no what that is.
If not in game mode what mode are you in and what settings? Edit: just put it in standard. The colors seem to instantly pop back when I did this. This could be a game changer. Been playing with about every setting in game mode.
 

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Everyone knows that it works on the OLEDs with HDMI 2.1. No one is clarifying whether the CX renders 4K 120 Hz at 4:4:4. All evidence shows that it downsamples to 4:2:2, and the C9 doesn't have this issue.
not sure what im stepping into kurian, why would a cx down sample to 4:2:2, that seems to defy logic.
also what evidence?

hanging to crack 4k 120 hz...
There is no evidence that any CX can do 1080p/120Hz 4:4:4 chroma or 4k/120Hz 4:4:4 chroma. It downsamples to 4:2:2. You can test the 1080p/120Hz mode with most newer PC sources. 4k/120Hz can be tested with any PC with a Turing card using the Club3D adapter. 1440p/120Hz is the only mode in the EDID with >60Hz refresh rate that supports 4:4:4 chroma.

RTings explains how to test here: Chroma Subsampling: 4:4:4 vs 4:2:2 vs 4:2:0

At this time, we need evidence that the CX can do 4:4:4 in either of those modes, not that it can't. If you have a HDMI 2.1 source and a CX and have been able to make 4:4:4 chroma appear (not just be listed as RGB input), please provide pictures.
 

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So I have the C9 and a 3080 and Gsync doesn’t work with 4k/120. My screen just goes black. Wondering if it works on the CX?
 

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Discussion Starter #1,430
Everyone knows that it works on the OLEDs with HDMI 2.1. No one is clarifying whether the CX renders 4K 120 Hz at 4:4:4. All evidence shows that it downsamples to 4:2:2, and the C9 doesn't have this issue.
Hmm what do you mean the c9 doesn't have this issue? All oleds have this issue, right? They can't display 444 outside of pc mode.
 

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Hmm what do you mean the c9 doesn't have this issue? All oleds have this issue, right? They can't display 444 outside of pc mode.
I believe he is referring to the fact that the C9 can do 1080p/120Hz 4:4:4 and 4k/120Hz 4:4:4 without downsampling to 4:2:2. The CX cannot. We do not know if this is a bug or intentional.
 

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LG CX 48, Vizio OLED55-H1, nVidia Shield TV, Google TV, nVidia RTX 2070S FE
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Haha, so 4k120 10 bit RGB/444 VRR will actually be 4k120 10 bit 422 no VRR? What a joke
 

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Haha, so 4k120 10 bit RGB/444 VRR will actually be 4k120 10 bit 422 no VRR? What a joke
I agree it's a joke that they're downsampling for seemingly no reason. With that said, who stated CX doesn't do VRR at 4k/120Hz? I haven't seen it tested yet. It requires Ampere to test. C9 has issues with it though.
 

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I agree it's a joke that they're downsampling for seemingly no reason. With that said, who stated CX doesn't do VRR at 4k/120Hz? I haven't seen it tested yet. It requires Ampere to test. C9 has issues with it though.
Someone just posted here it doesn't work on their 3080...
 

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Has anyone used the SHARC EARC with games? Does it add a delay or anything like that? Have a high end, older Denon Avr that if love to continue to use.

Also, the whole no 5.1 with arc/earc on pc is still an issue right?
 
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Haha, so 4k120 10 bit RGB/444 VRR will actually be 4k120 10 bit 422 no VRR? What a joke
This happens also at 8-bit color which would be plenty of bandwidth so it is most likely an issue with the firmware.

I own both a CX and C9 and with a 2080 Ti and Club3D adapter have a lot of trouble with color spaces on CX and none whatsoever on C9. The adapter does not support VRR so can't test that but C9 shows 4K 120 Hz 8/10-bit RGB HDR as it is supposed to while CX does interesting things.

NVCP, Windows Display Settings and LG CX 48 HDMI diagnostics screen all say "yes, I am sending/receiving 4K 120 Hz RGB" but in SDR mode it is clearly downsampled to 4:2:2 while in HDR mode it looks like it is 4:4:4 but does something weird with the colors instead. 4K 60 Hz does not cause this, C9 looks the same at 4K 60 and 120 Hz with the same computer and adapter. Do note that these differences are not easy to see without using test images.

So for HDMI 2.1 GPU and CX TV owners, I would love to see someone do the following testing:

Setup:
  1. Make sure Pixel shift is disabled in TV settings. This bug causes blurriness at 120 Hz.
  2. Make sure the TV is in PC mode. Home Dashboard icon for the input should be PC.
  3. Make sure HDMI Ultra Deep Color is enabled.
  4. Set Nvidia Control Panel settings to 8 or 10-bit color, Full RGB.
  5. Open https://www.rtings.com/images/test-materials/2017/chroma-444.png in an image viewer like for example Paint or Photos if you don't have anything better. Make sure it is 1:1 size and not zoomed in or out.
Test for 4K 60 Hz vs 120 Hz SDR:
  1. Set display to 4K 60 Hz, HDR disabled in Display settings.
  2. Make note of how the test image looks.
  3. Set display to 4K 120 Hz.
  4. Compare test image, do the last two rows look different (less sharp or somehow off compared to 60 Hz)?
Test for 4K 60 Hz vs 120 Hz HDR:
  1. Set display to 4K 60 Hz, HDR enabled in Display settings.
  2. Make note of how the test image looks.
  3. Set display to 4K 120 Hz HDR.
  4. Compare test image again, do you see a difference in sharpness or color saturation? Last two rows are easiest for evaluating sharpness.
 

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Discussion Starter #1,440
I believe he is referring to the fact that the C9 can do 1080p/120Hz 4:4:4 and 4k/120Hz 4:4:4 without downsampling to 4:2:2. The CX cannot. We do not know if this is a bug or intentional.
The c9 can't do 4k 120hz 444 without downsampling to 422 unless it is put in pc mode, and I expect the same on the cx. When you say "the cx cannot", you mean the cx can't do 444 without downsampling to 422 even in pc mode?
 
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