Think of it as the Radeon RX 580 / 480 replacement. It will be small, and is likely to perform as well as the Vega 14nm that shipped last year. In the Nvidia performance world Navi should perform close to Geforce GTX 1080 which is quite good for the mainstream part but probably on part of the mainstream part planned after the high end part.

Fudzilla has already reported that Vega 7nm is not a Gaming GPU. This might cause some confusion as there are two different abbreviations floating around. GPU as in General Purpose Unit, or GPU as a graphics processing unit. What we meant by saying Vega 7nm is not a GPU, we want to make crystal clear that Vega 7nm will not be a gaming part.