EDIT : I don't know what's happening anymore. AMD's own words aren't enough.
But I'd still like to see a review where Zen 1 and "2" are compared at the same clocks. If there's anything where there's a 10% gain at the same clock it must be a very specific scenario (Or say a game that's not consistent in what it's actually rendering)
Well this is how AMD arrive at 3%... look closely at this slide and look at my numbers....