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CAC-1085 & GTX 1070 + LG CX

Updated on 13-01-2021 in DisplayPort 1.4 to 4K120Hz HDMI Adapter
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7 on 06-01-2021

Hi there,

I’m looking to purchase a LG CX for watching movies, series and connecting it to my PC for some gaming from the bed. I have a GTX 1070 from ASUS and mainly use my PG279Q monitor using Displayport.

I’m wondering if I’m able to use the CAC-1085 adapter for 4k120hz gaming with my GTX 1070 and future LG CX? Does anyone run a similar setup?

The TV could end up being 4 to 5 meters away from my PC, so I’m also wondering if I’m able to use a different cable set up than the suggested 2m cable, or would I end up moving my PC?

Thank you for your suggestions!

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Baak 4 on 06-01-2021

I would not try to go over the max 2 meters if they say.

I got it to work on my old 1060 6GB and LG C9. But I don’t know if you can get it to work as well.

They dont promote it on these older cards… but if you dont try you would not know.

matsgd on 06-01-2021

Hey thanks for you reply! Are you able to show on the nvidia control panel how it’s running?

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Baak on 06-01-2021

Not anymore, changed to RX 5700 XT.

Simply put, I was able to select 4K 120Hz, no gsync, 12 bits. HDR I can not remember.

 

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matsgd on 07-01-2021

Right, thanks Baak! If I end up purchasing the TV I will probably go for it, don’t see why a digital cable would be influenced by its length, especially if it’s only 5 meters. Unless any employee would be able to tell me why..

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Baak on 08-01-2021

Maybe you can find that answer on HDMI it self.

https://www.hdmi.org/spec/hdmi2_1

Bare in mind that the adapter is an Active adapter and this might have influence on the signal over the length… But I think the 5 meter might work… but then again it might not. I don’t know hah just try it 🙂

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Pittyh 0 on 09-01-2021

Also 4k120hz doesn’t work on the latest nvidia drivers with cac-1085 you have go back to 456.71

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joevt 0 on 13-01-2021

Without DSC, DisplayPort 1.4 supports 4K 120Hz 10bpc 4:2:2.
If HDMI 2.1 doesn’t work, HDMI 2.0 supports 4K 120Hz 8bpc 4:2:0 (10bpc is required for HDR).

Does the CAC-1085 support 4:2:2 and 4:2:0? It doesn’t say on the product page.

The GTX 1070 doesn’t support DSC but the LG CX does support HDMI 2.1, so if 4:2:2 works, then you should be able to get 4K 120Hz 10bpc 4:2:2.

The 4K120Hz problem with Nvidia drivers – is that because of DSC (which the GTX 1070 doesn’t have) or the timing itself?

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