If by uncompressed you mean ripped from a UHD Blu Ray, they still have some video compression. But my UHD rips stream at an average of 80-100 Mbps, and I've never seen a peak higher than 180 Mbps. 801.11ac is more than enough for that amount of bitrate.
But I've never been successful streaming any of my UHD rips to a Roku player. First, the audio still has to be transcoded, as no Roku supports Dolby TrueHD or DTS Master Audio. But even with a wireless connection that is less than 5 feet, and the server is connected to the same Gigabit switch as the access point, I still get severe buffering that makes playback impossible. Several years ago I bought my first Nvidia Shield, and that's what I use for my UHD movies. Since it also supports the lossless audio codecs, I mostly use the Shield for my 1080 content as well. If you're going to the trouble of ripping UHD discs, you really want the Shield so nothing is transcoded. Roku players are still my go-to for my online providers, and for some TVs that don't have an AVR attached, so the lossless audio isn't a factor.
Dan
Roku Community Streaming Expert
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