the answer to your question is yes, that montior is capable of displaying 4k @ 60Hz. However, depending on the GPU, if you have more than one monitor connected it will drop from 60Hz to 30Hz. check the max resolution for your GPU, if it's 3840x2160 @ 60Hz that means it cannot power more than that. try connecting the 2nd monitor to your mobo. Also, check the monitor settings and make sure that DP1.2 is selected.