if you are looking to game and stream, look at this article : http://www.tomshardware.co.uk/game-streaming-encoding-coffee-lake-ryzen,review-34144.html.
As the other posters have said, it's not an upgrade, more of s side-step. For streaming and gaming (simultaneously) the 1600 will be better(as long as you OC it to about 3.8ghz)