Samsung 49" Odyssey G9 32:9 240 Hz Curved HDR G-SYNC VA Gaming Monitor - Manual (Page 19)

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Setting Optimum Resolution
An information message about setting optimum resolution will appear if you power on the product for
the first time after purchase.
Select a language on information message and change the resolution on your PC to the optimum setting.
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If the optimum resolution is not selected, the message will appear up to three times for a specified time even
when the product is turned off and on again.
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If you want to set the optimum resolution for your computer, please refer to (Q&A) → “ How can I change the
resolution? ”
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You can adjust the refresh rate according to the screen resolution by selecting Game → Refresh Rate in the
OSD menu.
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To enable the maximum refresh rate, set Adaptive-Sync / FreeSync to On or set Refresh Rate to HDMI : 144
Hz (C27G7*T* / C32G7*T*), DisplayPort1 , DisplayPort2 : 240 Hz