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Check the cable your using and graphic card drives. If you're using Nvidia, open the Nvidia Control Panel to set the refresh rate there instead of windows.
Sorry, there was a problem. Please try again later.This monitor supports refresh rate up to 165 Hz through DisplayPort connector. Should you face any issues with this, please reach out to the Dell technical support team for assistance in sorting this out. They are available 24/7 on social media platforms, Facebook and twitter(@Dellcares).
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