Vega 10 will be brokenly fast while vega 11 is still faster than Polaris 10 and rumoured to be between 1070 and 1080.
Vega 11 will be priced closer to rx 480 well vega 10 will be more expansive than a gtx 1070.
Vega 11 will be priced closer to rx 480 well vega 10 will be more expansive than a gtx 1070.