External monitor revolution only goes up to 1080p

Hi everyone,
     I just get my new monitor Dell U2713hm today, but I am so disappointed that the resolution of the new monitor only goes up to 1080p. The font looks blurry, so I want to adjust it to higher resolution. I have tried to use Dual link + MDP, HDMI + MDP, and MDP to HDMI cable(CONNECT, by Belkin, and it's labelled "4k" on it box). Still, none of them works...
     It's so annoying for see blurry things on the screen, please help... Thank you so much!!!
     I attach the screen shot to provide more details.
The above picture is showing the profile of my external monitor.

From MacBook Pro (Retina, 15-inch, Mid 2012) - Technical Specifications
Graphics and Video Support
Intel HD Graphics 4000
NVIDIA GeForce GT 650M with 1GB of GDDR5 memory and automatic graphics switching
Dual display and video mirroring: Simultaneously supports full native resolution on the built-in display and up to 2560 by 1600 pixels on up to two external displays, at millions of colors
Thunderbolt digital video output
Native Mini DisplayPort output
DVI output using Mini DisplayPort to DVI Adapter (sold separately)
VGA output using Mini DisplayPort to VGA Adapter (sold separately)
Dual-link DVI output using Mini DisplayPort to Dual-Link DVI Adapter (sold separately)
Are you using OSX or Windows (or some other OS)? What happens when you Option+Click  on Scaled button? Here is an example.

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    H
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    Message was edited by: Phillip Roh

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    Message was edited by: CyrilW

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    Message was edited by: pepparkaka

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