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A monitor states two demands: how many pixels it wants drawn, and how many times per second it wants them redrawn. Multiply the two and you have the real workload. Moving from Full HD to 1440p adds roughly 78 percent more pixels per frame, and moving from 60Hz to 165Hz nearly triples how often they are needed.
The five points below cover how to work through that matching, what the ports at each end need to agree on, and which half of the pair is worth spending more on.