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So you just need 3 4090's with 1 displayport each to the monitor and a whole new version of sli.
.. I actually wonder if the graphics cards could multiplex across multiple dp to a single display.
I vaguely remember that being a thing for early commercial 8k projectors, but I don't know anything about the implementation.
Two ports at once have been used for Samsung's 5120x1440 240hz monitors. Each port refreshes half of the screen and there are two scanlines going from left to right. Using the calc here you might be able to use two DP2.1 UHBR80 cables with DSC and nonstandard timings to run 4k 1000hz 10bit.
Ez