4k without VGA - Z87 Extreme4

First, your mother board is not the limiting factor for any of the Intel graphics specifications. The specifications are those of the HD 4600 graphics in your i7-4770 processor.

These are the specifications for your i7-4770, including the graphics:

http://ark.intel.com/products/75122/Intel-Core-i7-4770-Processor-8M-Cache-up-to-3_90-GHz#@specifications

These are the specifications for the display resolutions of the 4600 (right column) and other Haswell graphics:



You can check them yourself on this page (scroll past 1/2 down the page):

http://software.intel.com/en-us/articles/quick-reference-guide-to-intel-processor-graphics

Notice that the Ultra HD resolutions of HDMI are ALL at 24Hz for standard Haswell processors, even those with the Iris 5000 series and 6100 graphics.

Standard Ultra HD resolution is 3840 x 2160. The resolutions above that are just confusing people.

DisplayPort is the best interface to use for Ultra HD, and I would never buy an Ultra HD monitor that did not have at least one DisplayPort input.

You can certainly watch an Ultra HD video source with HDMI at 24Hz, that is the frame rate of movies shot on film. Ultra HD gaming would not be good at 24Hz.

DisplayPort supports 60Hz as you can see in the Intel specifications. Your i7-4770 is an 'H' processor.

Again, it is not your mother board's "... supported HDMI technology", it is the limitations of the Intel graphics and HDMI.

Is there a question here?