I understand you want to set up a 4k resolution at 60Hz so let me help you with this.
It is important to say that the processor you have (i7-4800MQ) is in fact HD 4600 and it should support 4k resolutions without a problem but you need to make sure you have the correct configuration to do so.
What I mean to say is that, as the Datasheet mentions, it is necessary to use a 2.1 DP cable or 1.4A HDMI cable (high Quality) with the correct Hz to make it work.
It is also important to say that this can be limited by the Computer Manufactures. This is because we provide the hardware to the Computer Manufacture and they will design and create their own systems including their limitations. This means that they can limit their own computers to resolutions or special features.
Now, there is always a way to force the resolution on a computer by using the Custommodeapp.exe in the computer (part of the Graphics Driver) or the latest software already has this included on the Intel® Graphics and Control Panel but you will need to play with the settings.
Here you can get more information about this: