Does it support HDMI 2.0? I wan't to know if I can use a 60Hz refresh rate on an external monitor.

I have a macbook and bought the usb-c digital av multiport adaptor so i could attach an external monitor. I am looking to buy he monitor and am looking at a 4k (UHD) option but not sure about the best or compatible options.

USB-C Digital AV Multiport Adapter

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    I'm fairly certain it's HDMI 1.4. I tried a 4K screen on the weekend and could not get the refresh rate higher than 30Hz. I was able to drive a Dell 27" at 2560 x 1440 @ 60Hz. Those are the only two screens I've tried so far.

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