Macbook pro 2012 not fully supporting samsung 4k monitor

hi
I bought the Samsung U28D590 monitor to use it with my Macbook Pro Retina mid 2012 model. though it connected comfortably, but the feel of the screen resolution was very poor. I checked it up with the setting, it showed me "best to fit U28D590 " and also showed 60 hrz. but somwhow, it looked like i was using a normal monitor, never felt like using a 4 k display.
Is something wrong. Need help.

You have posted to an iPad forum, I have requested the mods to relocate your post to a forum that you may get better answers.

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