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Blu-ray 4K content is an absolute maximum of ~150Mbps, but can be below 100Mbps. So with a 1G/1000M connection you can stream have 7-10 streams of 4K Bluray quality video simultaneously.

* https://en.wikipedia.org/wiki/Ultra_HD_Blu-ray

What does going to 10G, let alone 25G, get you? Are you really planning on 70-100 4K simultaneous movie streams on 10G, or 160-250 simultaneous streams on 25?

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That's missing some of the bigger picture. One of the reasons streaming 4k content is at a lower bitrate is because it has to deal with network hiccups and fit inside the buffer of most playback devices. A computer or phone has plenty of room, but streaming 4K content to a TV or chromecast/roku/firestick/etc. does not. Faster bandwidth means keeping the bucket full more reliably.

Are we sure that is true? Why would Netflix or similar pay out to give a better picture? Outside of a few AV aficionados, I doubt the average consumer would know or care.

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