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The highest average bandwidth shown was 73 mbps. You probably need 150mbps to comfortably play 1 4k move, but once you are looking at the effect 4k movies have on higher bandwidths, average bandwidth becomes more relevant. You could pretty easily stream 10 4k movies over a 1gbps channel since the odds that all of them will be over 100mbps at the same time is low (and even if it happens briefly, it will be handled by buffering).