Network - Wireless & Wired Connections

Help & troubleshooting for network issues, including connecting your device to your home Wi-Fi network, connecting to public networks, troubleshooting wireless issues & ethernet connections, and optimizing streaming performance.
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montecarlo1987
Level 7

RE: Is There A Difference In Mbps Or Bandwidth Using A Roku Express 4k+ On A 1080p TV Set to 1080p?

Hello. It is commonly accepted the Roku Express 4k+ when using a 4k TV when set to a 4k setting requires approximately 25 Mbps +/- 5 Mbps for streaming. Also known as 4K (2160p), this resolution uses five times more data than HD video and requires at least 25 Mbps of bandwidth. HD video uses approximately 5-7 Mbps. Question: When you set the Roku Express 4k+ to 1080p or HD resolution for a 1080p HD TV, does the Roku Express 4k+ INITIALLY transmits approximately 25 Mbps data stream for the streaming app in 4k and THEN DOWNGRADED (backwards compatible) in the final leg of the data stream to 5-7 Mbps ONCE IT REACHES the 1080p TV (in addition, losing the HDR feature when 1080p TV does not have HDR too)? ...or… Does the Roku Express 4k+ when set to 1080p resolution for a 1080p TV transmits AT ALL TIMES 5-7 Mbps from streaming app to 1080p TV like the Roku Express (HD)? Please explain. 

I am aware Roku Express 4k+ uses fast wi-fi streaming whereas the Roku Express HD uses standard wi-fi streaming. I would assume the Roku Express HD device when set to 1080p resolution (highest resolution) for a 1080p TV transmits AT A MAXIMUM AT ALL TIMES 5-7 Mbps from streaming app to 1080p TV because the Roku Express HD's standard wi-fi streaming that is the maximum bandwidth and Mbps?

This would mean (if true) the Roku Express 4k+ would need from your ISP a delivery of approximately 25 Mbps +/- 5 Mbps for streaming EVEN IF you had no use for it when you only had a 1080p TV (when the Roku Express 4k+ resolution is set to 1080p)?

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andyross
Level 16

Re: RE: Is There A Difference In Mbps Or Bandwidth Using A Roku Express 4k+ On A 1080p TV Set to 108

It's somewhat depending on the particular channel on how it buffers and the actual compression level. I would think that it would not try anything higher than 1080p if your device does not support it. Even 1080p can be surprisingly low bitrate with some of the latest compression techniques. The 5Mbit is a recommendation to allow enough overhead to keep the buffer easily filled.

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