4K on a provider's homepage is a label, not a measurement, and a review that repeats the label without a bitrate number hasn't actually tested anything. Real 4K video needs roughly 15-25 Mbps of sustained bandwidth to stay sharp and stable; below that range, a stream either drops to a lower resolution automatically or starts to stutter. A review that says a provider looks great in 4K without mentioning bandwidth is describing one moment on one connection, not proving the claim holds generally across a household.

Expect a genuine 4K live stream to use about 15-25 Mbps and roughly 7 GB of data per hour, which adds up fast across a household with more than one screen running at once. Compare that to 1080p, which needs about 5-8 Mbps and roughly 3 GB an hour, less than half the load. If your connection can't sustain the higher number during peak hours, no provider's stream, however it's labeled, will hold a true 4K picture through a busy evening.

Two streams both labeled 4K can need very different bandwidth depending on how the video is compressed. HEVC, sometimes called H.265, typically needs about half the bitrate of older H.264 encoding to deliver the same picture, so a provider using HEVC can hit real 4K at a lower connection speed than one still using H.264. A review that calls out the codec, not just the resolution label, is telling you something you can actually verify against your own internet plan.

Pick one live 4K channel and watch it for a solid 20 minutes during your household's busiest hour, the time everyone else on your connection is also online. Watch for the picture dropping to a visibly softer resolution or for repeated freezing longer than a few seconds, since a live stream arrives in short segments and a stall past that buffer shows up as a visible freeze. That one test tells you more about a provider's real 4K performance than any written review will.