Question 4k Moniter

Apr 21, 2019
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I build a new pc with rtx 2080 ti but iam confused on moniter . I want to buy a 4k moniter but my budget is 1000$ . In this budget i see a 4k moniter with 60 fps. when i play games on 1440p and 1080p can i also got 60 fps. So iam confused in fps