Having same/similar issue here... Not sure if that helps anyone, but I had this issue on 4090 with 13900K processor.
Here is a little info on what I am running MCTRL4K custom resolution 5280x1056. Timing set based on the ultra high resolution spreadsheet provided by Novastar on their website ...
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- Wed Nov 22, 2023 02:53
 - Forum: Problems? Bugs? Solutions!
 - Topic: Output flickering
 - Replies: 102
 - Views: 12767478