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I want to change refresh rate from 60Hz to 75Hz, but xrandr shows that this card does not support 75Hz refresh rate. On Windows this not work too. Can somebody help me?

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up vote 0 down vote accepted

Did you installed the driver. After installing driver in both if you can't change the refresh rate. That means the device doesn't support it. It is a hardware limitation. Noone can do anything.

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Your video card does not support 75Hz refresh rate for current resolution. You may decrease resolution to see if 75Hz become available. If satisfied, keep it, if not, you have to change the video card for a better one.

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