Intrinsic said:
Wha google and no one seems to be saying is how you will need an internet connection of around 50Mbs to be able to stream at 4k60fps.

Anything less than that and you will basically be playing at a lowerrez or lower fps.

Google said 4k60 would require 30 mbps.

"So with Project Stream [the beta test for Stadia], we recommended and set a threshold of about 25 megabits per second in order to enjoy 1080p / 60 frames per second," Harrison said. "In fact, we only used about 20 megabits per second. But we gave ourselves a little bit of a buffer in the calculations. When we launch, because we’ve made some very significant improvements to our encoder, our streamer, and our compression algorithms, we will get 4K / 60 frames per second in about 30 megabits per second. And then if you are at a lower resolution, you will obviously use significantly less bandwidth."

https://www.gamesradar.com/google-says-that-if-you-can-watch-youtube-you-can-play-stadia/