Ultra HD monitor with Macbook pro 13 mid 2014
Ok, it seems like macbook pro 13 mid 2014 theoretically can serve  3840x2160x60hz, but apple won't support it. 

There is a tool called SwitchResX, it can help maybe, but it requires System Integrity Protection to be disabled while install. I don't like the idea of disabling system security things in mac os, and i'm not even sure that it would work well.