Why can’t I set the frequency to 144Hz on my monitor?

Please check the following:
1) Make sure your graphics card has a DVI port and a DVI cable is used.
2) Make sure the BenQ bundled DVI cable is used.

Note: only DVI supports 144Hz on the XL2411. Both DVI and DisplayPort 1.2 support 144Hz on the XL2411P.
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