Samsung CJ791 34" 21:9 Curved FreeSync VA Monitor - Manual (Page 20)

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Connection Using an HDMI-DVI Cable
Check to make sure that the power cables for the monitor and external devices, such as
computers and set-top boxes, are not connected to the power outlet.
HDMI IN
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The audio function is not supported if the source device is connected using the HDMI-DVI cable.
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The optimum resolution may not be available with an HDMI-DVI cable.
Connection Using an DP Cable
Check to make sure that the power cables for the monitor and external devices, such as
computers and set-top boxes, are not connected to the power outlet.
DP IN
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To display 3440 x 1440 @ 100 Hz, use a DP cable that supports 3440 x 1440 @ 100 Hz. Make sure that the
graphics card of the DP source supports 3440 x 1440 @ 100 Hz.