This cable supports 4k @ 60Hz perfectly. I picked this cable over others for the braided wire. However, if you've got a Dell P2715Q, you might be better off with a USB-C to DisplayPort adapter. Dell's initial versions of this monitor only support HDMI 1.4, and therefore a maximum frame rate of 30Hz. The newer ones (purchased after Feb 2016) support HDMI 2.0 and 4k @ 60Hz, but you've got to first enable a special setting. I was able to do this successfully, and since I'm using the DP port on the monitor to connect a different machine, I'm thankful to be able to leverage both ports at 60Hz without having to swap the cable out or use a special adapter. But, just be aware that this requires an additional step to configure.
You can enable HDMI 2.0 in your P2415Q or P2715Q flat panel displays purchased after February 2016 using the following steps:
Unplug all video cables from the display. (Leave only the power connected to the display.) Unplugging from your computer is insufficient; you must unplug the HDMI cable from the back of the monitor! Power on the display. Select the HDMI (MHL) input option. (A floating dialogue box will appear.) Press and hold the button associated with the Green check mark for 6 to 8 seconds. A dialogue box appear that states HDMI 1.4 Enable/Disable Select the option to Disable HDMI 1.4 support and press the button next to the green check mark to confirm the selection. Re-connect the video cables to the display