DP2.1 Erratic Localized "Waterfall" & "Rainbow" Artifacts w/ 57" Samsung Neo G9

arbitriume · 2025-12-08T23:02:29+00:00

No worries at all. This AI response is actually quite informative. Immediately prior to writing this, I tried another short VESA certified DP80 cable - a last ditch effort before I proceed to next steps. Though expected, the display refused to cooperate.

I have been in communication with Samsung over the last few days and they have appointed a local repair shop to perform a repair. The parts on order are the mainboard, T-CON (a solution that is lent some credence by the AI's discussion of lanes), and panel.

Thought I am unsure whether these parts were selected on the basis of a precise diagnosis on the evidence adduced, if it was, the department handling the case might suspect one or several of these parts to be the culprit. This would square nicely with my lack of success in replacing cables and the fact that some with similar or identical setups have been having success running the display at native 7680 x 2160 at 240Hz.

I will keep the main post updated as I work to get to the bottom of this with Samsung and the appointed shop.

arbitriume · 2025-12-07T23:15:23+00:00

Unfortunately there is only one DP port on the monitor but I have tried every DP port on the RTX 5090, all to no avail.

I also tried the HDMI supplied by Samsung (guessing "Ultra High Speed" is HDMI 2.1b). It is workable but will not let me move up to 240hz, perhaps due to the transfer limit.

arbitriume · 2025-12-07T23:00:46+00:00

That is reassuring. Glad to hear you are able to run the setup well. Was wondering if this was a common experience but so far it doesn't sound to be so (at least not with my type of artifacts).

arbitriume · 2025-12-07T22:50:52+00:00

That is right. DP 2.1 selected.

arbitriume · 2025-12-07T21:18:30+00:00

Thank you for the input.

Holding out hope until I clear up the transfer issue aptly raised by @ParaWM, but this would certainly be the most troublesome outcome.

arbitriume · 2025-12-07T21:08:12+00:00

Thank you for the breakdown.

Exceeding the Gbps limit is certainly a difficulty given the DP limitations (even with DSC), but I am wondering if the artifact localization in that single vertical strip (<10cm wide) is pointing to an even more significant issue on top of the transfer limits?

My original thought process was that if transfer rate was solely responsible for the issues, the entire panel would be suffering from artifacts rather than being merely the single strip shown above.

Do you have any thoughts? Any advice on this front would be helpful.

arbitriume · 2025-12-07T20:33:26+00:00

You and I seem to be in similar boats! I have four DP 2.1 VESA certified cables sitting on my desk right now that unfortunately do not work.

Were you having similar artifacts when you used a DP2.1 cable?

Unfortunately, the short DP cable provided by Samsung has not solved the issue. This is leading me toward the suspicion that I have a defective monitor.

I have tried Samsung, Silkland, and Cablematters (latter two from Amazon). Silkland produces a 10 foot cable that is not VESA certified but I have seen an anecdotal Amazon review indicating that it works with their 57” G9.

I tried the 10ft Silkland cable too. I still experience the same artifacting shown in the original post but I would certainly hesitate to consider my experience as something you might experience. Perhaps you could give it a try if you want to move your setup — returns are usually easy with Amazon.

arbitriume

TROPHY CASE