Your internet connection speed

[leninmac]

im a sky subscriber, 16mbps is fast enough...i can play demo 4k videos on youtube with little or no buffering

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That might depend on the video streaming provider. I'm a cable cutter and I mostly rely on steaming service like Amazon Prime and Netflix. In Netflix for example to get UltraHD streaming for their original series ( like Stranger Things, House of Cards, Daredevil, etc. ) A steady internet connection speed of 25 megabits per second or higher is required.