Thanks again for all replies.
Yes, it is DisplayPort I'm interested in. As previously mentioned, the EVGA GTX 750 has DP output: http://www.amazon.com/EVGA-GeForce-D...s=evga+itx+750.
It would be only a single monitor. Not used for gaming.
Sounds like the consensus is that it should be able to push 4k @ 60 hz via DisplayPort. Would be very curious to hear if anybody has actually done it though, because sometimes theory and practice do not align.
The technology required is DisplayPort 1.2 with MST
MST is basically separating the single cable into 2 separate displays (you can get DisplayPort splitters to increase the amount of multiple displays)
The monitor also has to support MST over DP as well (which this new generation of 4k 60hz TN/IPS do)
So in this case, the monitor (over DP w/ MST) will create 2 monitors, left and right, with each monitor being 1920x2160, for a combined 3840x2160.
Not sure if the EVGA GTX 750 w/ DP has MST. Research?