Glenwing

What graphics card is on the PC?

Max is 4 on NVIDIA, not 3.

5700 XT dropped to 4 displays max, that's why they carefully changed the wording to say "6 display outputs" instead of "supports 6 displays". https://www.amd.com/system/files/documents/radeon-rx-5700-series-quick-start-guide-en.pdf

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The final output of any display of this type (light exiting the panel) is analog, each pixel is a single value anywhere along a large scale of different brightnesses and colors. The pixel data is a sequence of some pattern of high and low values that together represent the digits of a number representing what ratio of its maximum brightness each pixel element should be. That number needs to be translated into the actual pixel value (and ultimately into the voltage or current used to drive the pixel), which is a digital to analog conversion. The only "true" fully digital output (as far as I know) is plasma, but I'm not sure that's an advantage.

Can you take a screenshot as a PNG file and attach it?

Source?

That's per HDMI 2.0 spec. https://linustechtips.com/topic/729232-guide-to-display-cables-adapters-v2/?section=calc&mode=maxfreq&H=2560&V=1440

Right, so each of the 4K 120 Hz is 1 display, because it doesn't need DSC, and the 4K 240 Hz counts as 2, so 1+1+2 = 4, which doesn't exceed the max limit, so it's allowed. It's 120 and 240 times 1000/1001 which is a standard value for historical reasons related to the transition from monochrome to color television in the US.

NVIDIA has a limit of 4 displays per card. If the resolution/refresh rate is high enough to require DSC, then it counts as 2 displays. 4K 240 Hz requires DSC, so you will be limited to 2 displays (each counts as 2, so you will reach the max limit of 4). 4K 120 Hz is the max limit of DP 1.4 without DSC being required, so that is the most you can do if you want 3 or 4 of these displays. https://nvidia.custhelp.com/app/answers/detail/a_id/5338/~/using-high-resolution%2Frefresh-rate-displays-with-vesa-display-stream

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Does the current guide not answer this?

Yes, just connect with two cables and set up PbP. The monitor won't know it's the same computer, it just sees two separate video sources, and the computer will see two monitors.

10 series does not support DSC.

See my edit above. Did you install the pixel clock patcher? https://linustechtips.com/topic/729232-guide-to-display-cables-adapters-v2/?output=DVI&input=HDMI

I've used the bluerigger cable linked in the guide up to 4K 60 Hz before. https://www.amazon.com/dp/B004S4R5CK/?tag=linus21-20 What graphics card are you using? AMD cards need to have the pixel clock patcher installed.

This is not really correct; "Maximum resolution" on graphics cards is a kind of fake spec. See here:

It's the edge of the screen, the top glass cover extends further out until it meets the plastic casing but the screen underneath doesn't. Put on a pure black image and you will see the panel backlighting ends at that edge.

That's the physical edge of the screen.

Not from me, I haven't tested any fiber cables.

Please post a picture

For Ultra High Speed HDMI rating, you most likely do.

10-seried GPUs don't support DSC at all. DSC is not needed for 1440p 240 Hz unless 10 bpc color depth is activated. If that were the case then he wouldn't be able to set 240 Hz at all.

Can you run `xrandr --verbose`?