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Hello all. Admitted dumbass here. I'm hoping to get some help with getting my setup right. Here's what I have: >Win11, latest updates >RTX 4080
>HDTV1 = Samsung 65in QD-OLED 120Hz, model QN65S95BAFXZA
>HDTV2 = Samsung 65in 4K UHD 120Hz, model UN65RU8000FXZA
What I'm trying for is:
>both displays to have 4k (3840x2160) @ 120Hz. Right now, with as much tinkering/settings-changes I could accomplish, I've only been able to get:
>HDTV1 = display 2 via Display Settings, connected via DisplayPort(PC)-to-HDMI(TV), 2560x1440 120Hz and
>HDTV2 = display 1 via Display Settings, connected via HDMI(PC)-to-HDMI(TV), 1920x1080 120Hz
(I know the "HDTV1 as Display 2" and vice-a-versa is confusing, but it's that way due to the layout and setup i my home. My guess is because HMDI is the first port on the GPU, then the DisplayPort is the second port.)
In any event, I am trying to get 4k/12-Hz on both TVs via my 4080. What do I have to to to make this happen? What specific cables do I need to buy (thought I do believe I'm using high-performance cables to both TVs)? What settings in either Win11 Display Settings and/or NVidia Control Panel? I'm willing to answer any other questions if more info is needed. And if, given this setup, it can't be accomplished, please let me know why not.
Please help. Thanks in advance!
>>
>>1505658
As a suggestion check the /pcbg/ threads on /g
>>
Try adding a Custom Resolution in Nvidia Control Panel
>>
>>1505660
I've looked into that, it tells me to go to manage 3d settings but I can't figure out how to create customs for one TV, much less both
>>
File: custom.webm (2.76 MB, 1902x1032)
2.76 MB
2.76 MB WEBM
>>1505661
Hopefully this helps
>>
>>1505664
Yeah the customize option wasn't available for me, because I didn't read and had to disable settings on 3d settings.
I've gone into both displays and created a 4k/120hz profile. Now my question is, once I've created them (again, per each display) and that custom resolution appears in the Customize popup menu and I've placed a check mark to the left of that profile... Is that display set to that custom resolution? Or does it just ADD that custom resolution to the list under "Resolution" on the mzungu 'Change resolution' page?
>>
>>1505667
I think that depends on whether you click the bigger "Apply" button on the bottom of that whole window or not. I forgot how it goes but you might have to take that extra step of clicking apply at the bottom or in the Windows Settings page?.
>>
are you SURE the HDMI cable is rated for 120Hz?
>>
>>1505686
Lemme work on finding the cables I bought and I'll post either the stats or the link to the page.
>>
>>1505658
>I do believe I'm using high-performance cables to both TV

HDMI cables in their blister packs hanging on the store racks are typcially marked:
-----> High Speed HDMI Cable:
Supports 4K resolution at 30Hz
-----> Premium High Speed HDMI Cable:
Supports 4K resolution at 60Hz with HDR (High Dynamic Range)
-----> Ultra High Speed HDMI Cable:
Supports 4K resolution at 120Hz and even 8K resolution

Look at the printing on your HDMI cables. You specified 4k (3840x2160) video for these cables. So the markings on the cable will be:
"High Speed HDMI" or "Premium High Speed HDMI" for 4K video at 60Hz refresh. If you have 120Hz refresh then look for "Ultra High Speed HDMI" which handles 120hz.
>>
Am I crazy but I don't see any HDMI cable not being able to handle 1080p @ 120hz. Am I fucked up?

If anything a Displayport to HDMI is what I'd try while I'm at it.
>>
>>1505713
So I can't 100% verify if my cables are rated for 120hz. Today I'm gonna go buy good ones. I'll try buying two rated cables and installing them to my setup and see what happens after.

For now I've done the "custom resolution in NVCP" but I still can't verify if I'm getting 4k/120hz after I hit okay/apply. I'm gonna try the cables next and see what happens.
>>
File: 8baantje-2v6xlc.webm (2.82 MB, 1280x720)
2.82 MB
2.82 MB WEBM
>>1505727
The Amazon Basics HDMI cable claims to handle 4K @120hz and 8K @60Hz:
https://www.amazon.com/AmazonBasics-High-Speed-HDMI-Cable-Black/dp/B08BS181P2?crid=19GD55S5HYMNV

HDMI 2.1 cables support up to 48 Gbps of bandwidth, which is necessary to carry the data required for 4K at 120Hz. They are designed to handle 4K at 120Hz and can handle the datarate for 8K at 60Hz. HDMI 2.1 also supports features like Variable Refresh Rate (VRR), Auto Low Latency Mode (ALLM), and Enhanced Audio Return Channel (eARC).

While HDMI 2.0 cables can handle 4K at 60Hz, they are not suitable for 4K at 120Hz due to their lower bandwidth limitation of 18 Gbps.
>>
The rabbit hole goes deeper...
So last night I went to a local BB and bought an hdmi-to-hdmi cable for the HDTV2 listed in my op. It is rated to handle 8k at 144hz and 4k at 120gz.
>https://www.bestbuy.com/site/rocketfish-8-8k-ultra-high-speed-hdmi-2-1-certified-cable-black/6430950.p?skuId=6430950&extStoreId=1781&utm_source=feed&ref=212&loc=19597536189&gad_source=1
Got it home, installed it, went to windows display, set that TV to 4k...and it still left the hz at 30. Tried it via NVCP, same thing. Cannot select 4k 120hz
Okay. So..
I made the custom resolution of 4k120hz,hit split and... You can see it activate and be on that custom resolution but then it jumps down to the 2k option on its own.
So I did some more research. I'll have to find the reddit post but I found a thread that basically lays out that my HDTV2 is not a true 4k120hz TV, that it does it via... Interopelation or something like that.
Basically, long story short for my SECOND HDTV, it can't actually do 4k120hz
As for my hdmi1, I'm waiting on a high speed hdmi-to-displayport cable to come in. Maybe next week, with the holidays who knows.
I'm beginning to get the idea that with these two tvs I'm gonna have to live with whatever highest 120hz resolution they will allow, because it will not be 4k120hz.



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