resolution retina MacBook display and external

I have a MacBook to the retina 12 inches early 2015 with a multiport Apple USB - C card that has a HDMI connector. I am using a monitor Dell 27 ' u2713hm with a HDMI cable. However, the display preferences do not allow me to set the resolution. I have the choice between the default value for display (and this is 1080 px, even if the screen has a native resolution of 2560 x 1440) and update the scale that offers a resolution of 1080 or lower. How to use my monitor at its full resolution with HDMI connector I have on the multiport card?

Thanks for your help

Samuel

As far as I know, the U2713HM Dell only supports 1920x1080@60Hz via its HDMI port.

http://superuser.com/questions/606946/does-the-Dell-u2713h-support-2560-x-1440-o worm-hdmi - 60 fps

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