1050 TI and LG CX (with actual content this time)

4 replies

I just hooked this up and am having some troubles getting it to work with my 77" LG CX and my 1050 TI in my HTPC.  I have tried a few different drivers 442.75, 456.71, and 471.68 and on the later ones it sometimes offers 4k@100hz after a power flicker but after selecintg it never works and just shows two black bars or crashes the computer.  Are there some Nvidia Control Panel settings I should be changing?  I am using one of these at the moment https://www.amazon.com/gp/product/B08KSY32VR/ but I have one of these on the way https://www.amazon.com/gp/product/B07H5Y5N55/

Are there any other things I should try?

Most likely, the problem lies in something else than in the drivers or the video card / monitor. I would conduct a full diagnostic of all components.

I had already updated the firmware.  It does have DP1.4 but no DSC so the max I can get out of it is 4k@120hz HDR in 4:4:4 which I guess is good enough.  I had to force a custom resolution in the nvidia control panel though.  It is weird the colors seem darker compared to when I use a regular HDMI cable though. even though they have the same settings for both ports on my tv.

DP 1.2 has more bandwidth than HDMI 2.0 but doesn't support 4:2:0. Depending on the display and the adapter, DP 1.2 may be able to do the following 4K modes (assuming the display can do HDMI 2.1; assuming CVT-RB timing/not HDMI timing; assuming 3840x2160):

  • 60Hz 10bpc 4:4:4
  • 80Hz 8bpc 4:4:4
  • 95Hz 10bpc 4:2:2
  • 110Hz 8bpc 4:2:2

The Pascal series of Nvidia cards should be able to support DisplayPort 1.4 but they do not support DSC which the CAC-1085 uses to get some HDMI 2.1 modes. Without DSC, you should be able to get the following 4K timings (give or take a few Hz):

  • 95Hz 10bpc 4:4:4
  • 115Hz 8bpc 4:4:4
  • 140Hz 10bpc 4:2:2
  • 170Hz 8bpc 4:2:2
  • 180Hz 10bpc 4:2:0
  • 220Hz 8bpc 4:2:0

Notes:

  • 10bpc is required for HDR.
  • 4:4:4 uses same bandwidth as RGB.
  • The adapter or display might not support some modes.

If Nvidia drivers are crashing then maybe that's an issue for Nvidia to solve - after you make sure you have the latest drivers.

Try Linux to see if the adapter behaves better in a different OS.

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