This USB-C to DisplayPort cable supports up to 2K@165/144Hz (2560*1440), 1080P@240Hz (1920*1080) and compatible with 21:9 ultrawide monitors up to 3440*1440@144Hz. This cable can bring you a perfect experience. A durable braided nylon cord and anti-corrosion aluminum shell keep you away from signal interference. If the product does not work for you at proper resolution/refresh rate, please kindly try updating the Operating system on your video source device (Especially for Apple products users). If your issue still exists, please feel free to contact us. We will provide help as soon as possible.