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you can't, it's capped at 60hz. the monitor has hdmi 1.4 which doesn't support 120hz
Sorry, there was a problem. Please try again later.If you are unable to go beyond 60 hz refresh rate, this is likely because the video card in your computer/console/laptop does not support more than 60 hz. If you can verify your video card does support 120hz, please contact Acer support at 866-695-2237.
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