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Triple 2560x1440 isn't 12K. Triple 3840x2160 isn't even 12K.
eah I know, it was just easier to use 4k screens to make the point than go hunting resolution references for the in between monitors. But still What sort of hardware are you looking to buy if you even take these resolution you mentioned like 11520x6480 What will you need to enjoy decent framerates and settings at that end of the spectrum, assuming one is into gaming. Its i think the major factor in deciding if you think you might want triples one day. I had the dilemma myself recently and was thinking of getting the rog swift. But ild never be happy with a single screen, but running 3 of them would take insane amounts of money to power them.