4k tv mode not supported

4K only works with HDMI 2.0 and DisplayPort, so you will need a GPU with HDMI 2.0 and an HDMI 2.0 cable, or a GPU with Displayport, a DisplayPort to HDMI 2.0 adapter and an HDMI 2.0 cable.
 
I wasn't speculating, the OP could very well come back and say "I do have X" and then we can move on. :)
 
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