Question hp 27f 75Hz

Jan 25, 2020
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W10, Asus Tuf Gaming B460-plus, i10-10100, hp 27f monitor, hdmi connection.. Problem: monitor's specs are 75Hz, but by default it shows a message that the Optimal is 60Hz. I can change the refresh to 75Hz though. Why is 60Hz the optimal, and chosen by default?