You need HDMI 2.0 if you want to do 3840x2160 at 60Hz. HDMI 1.4 only supports that resolution at 30Hz. http://en.wikipedia.org/wiki/HDMI#Versions
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I was just about to pull the trigger on a Mac Pro and a $6K 4k TV. I was doing the research on the TV side to make sure the display is compatible only to find out, unexpectedly, that the Mac Pro is the limitation.
You need HDMI 2.0 if you want to do 3840x2160 at 60Hz. HDMI 1.4 only supports that resolution at 30Hz. http://en.wikipedia.org/wiki/HDMI#Versions
I was just about to pull the trigger on a Mac Pro and a $6K 4k TV. I was doing the research on the TV side to make sure the display is compatible only to find out, unexpectedly, that the Mac Pro is the limitation.