my wife bought us a 4k vizio M65-C1. There's 5 HDMI ports but only one shows 4k@60p all the rest are 4k@30p. What is 60p/30p? is that the same as 60/30hz? I cant seem to get my pc to run at 60hz when plugged into that port. Sorry for the dumb questions but I've been so excited about it. Also are there HDMI 2.0 spec cables or am I good to use a displayport to HDMI adapter?