Question Problem with Xiaomi 34-inch curved monitor on Windows 10 ?

Jun 28, 2022
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Hello.
i have xiaomi monitor 34 inch curve with resolution 3440 * 1440 and i use a GTX 730 with max resolution 3880 * 2160.
i have problem with my monitor . when connect my monitor to pc, in display settings i have recommend resolution 3440 * 1440 but i also see another resolution ("not recommended") its 3880 * 2160 in display settings.

When i set it to 3880 * 2160 my monitor freezes and after 2 or 3 times on and off my pc restart. and its not working until i change my windows.
i dont know whats the problem . my monitor work correctly in recommended resolution but i want to know why dosent work on 3880 * 2160 resolution ?
My graphic card is correct because i use it on sony 4k tv and it was working correct.