I have yet to test it for video, but the displayport supposedly supports 4k@60hz.  Most TV don't have a displayport only HDMI, so you will need to get a DP to HDMI converter but I am not sure if it will work.  So I have not tested it to see how will it works for video applications for your entertainment system.But for audio, it works well.  I have it connected it to an external DAC via USB, however I did have to get a separate USB PCI-e card to dedicate the USB controller for the DAC otherwise, you will hear USB data to the DAC lag.  But not counting this minor issue, the PC is solid, decent spec, fairly powerful, works for what I need.  And the fact that it's full sized, you can upgrade/add fullsized PCI cards for future needs, for instance, if the DP doesn't support 4k@60hz via an HDMI adaptor, you can get a new video card with native HDMI port support 4k@60hz.