In graphics tests the "66AF:F1" outperforms the Radeon RX 580, but in compute workloads there's little difference.
In compute benchmarks, however, the card is almost similar to the Radeon RX 580 which is what we had also been expecting since AMD Navi GPUs was tailormade for maximum graphics and gaming performance rather than compute horsepower. The deals with Microsoft and Sony for their next-generation consoles made that much very clear. So it’s easy to tell that the desktop PC and notebooks parts would be getting a similar treatment.Take this information with a grain of salt, we have no way to assess the accuracy and things can change between now and the launch date of Navi.