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1920x1200 is the max you can use with HDMI.
Optimal Resolution:
1920 x 1080 at 60Hz
That one will only do 1920x1080 max. Therefore the HDMI cable is fine.i think so here is a link to the screen.
http://www.dell.com/us/en/dfh/monit...pd.aspx?refid=monitor-dell-st2310&cs=22&s=dfh