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CAC-1080, can i force VRR through hdmi at 1440p@120hz? from a 2080ti to a LG C9?

CAC-1080, can i force VRR through hdmi at 1440p@120hz? from a 2080ti to a LG C9?

Updated on 26-11-2025 in Adapters and Cables

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Pittyh 7 0 on 01-08-2019

Hi,

i have a LG C9 with hdmi 2.1 ports, the TV is capable of 4K@120hz over hdmi2.1

I also have a 2080ti which has hdmi 2.0b

If i connected them with a CAC-1080 and used nvidia control panel to turn on adaptive sync as below.

https://nvidia.custhelp.com/app/answers/detail/a_id/4768/related/1

There is a feature which enables adaptive sync output over displayport

Can i get 1440p@120hz with adaptive sync (VRR) working?

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CLUBBIE 0 0 on 02-08-2019

Hello Pittyh,

Thank you for your question. The answer is no i’m afraid, Adaptive sync at 1440p@120 will not work.

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Pittyh 0 0 on 02-08-2019

Ok thanks mate, hopefully the displayport 1.4 to hdmi 2.1 adapter you “may” or “may not” be working on will fix all the issues. 😛

Thanks.

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magicarpet 0 0 on 06-08-2019

VRR requires HDMI 2.1

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CLUBBIE 0 0 on 06-08-2019

Hi,

The option to use VRR is not possible with the cac-1080 due to lack of bandwith.

Liked by

Leoeeler 0 0 on 14-10-2025

That’s a great question! From my experience, enabling VRR at 1440p@120hz between a 2080ti and an LG C9 can be tricky, as the C9 officially supports VRR mainly at 4K. You might want to check out discussions among the Football Bros for more tips. Sometimes, a firmware update or custom resolutions can help.

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simonwill 0 0 on 20-10-2025

The CAC-1080 can’t pass full VRR since it’s limited by HDMI 2.0 bandwidth. Even with custom slope resolutions, you’ll likely get 1440p @ 120 Hz without VRR.

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SamuMorrison 0 0 on 26-11-2025

It’s great to hear about your setup! While the LG C9 is an excellent choice for 4K gaming, connecting your 2080 Ti through HDMI 2.0b may limit some capabilities. If you’re looking to optimize your performance, the Cps Test platform could help you gauge your system’s responsiveness and ensure everything is working smoothly. It’s always good to know where you stand with your hardware!