Since you are so adamant about the Nvidia 10x perf BS. They made up their own performance metric and used that to get to their magical 10x number... which their "new" architecture doesn't even support across all products.
1.7x from FinFet means that they choose a balanced approach to their design, taking into account frequency, density, and power savings.
And no, it is no longer a 2x perf/w increase from 14FinFet. It is upto a 2.8x perf/w increase from 14FinFet and the Polaris architecture.
And you don't think AMD just made up their own metrics for their own AMD technologies software?
This is what marketing does and always will do.