Question 2 monitors 144hz and 60hz

Feb 20, 2019
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Hi
I have two monitors one is 60hz Acer and second one is AOC ag241qx 144hz. The problem is when i have some window with video or something what moving on Acer 60hz monitor, my AOC behave like 60hz not like 144hz and doesnt matter if a playing game or in windows do my things. Everything behave same like 60hz. This me bothering me a lot becouse i just wanna play games and watch some twich. Its disappointing me that a lot. For AOC i have D.port , Acer i have it on HDMI.
My spec are
Ryzen 2600x
32gb ram Corsair Vengeance 3200ghz
Msi 1080 Gaming plus
MSI Gaming Pro x470
Please can somebody help? i tried a lot of thing but i was not successful. Thanks