People who are comparing 480 with GTX 1070 are insulting human intelligence.
480 is for VR entry with a good performance. It is on par with R9 390 on stock and even if it OC then still it is no way near GTX 1070. It cannot be OC like people are hyping it and whole purpose of the card is demolished by it. Its main goal is performance per watt.
Insulting human intelligence you said..?..
Polaris is clocked 20% higher and has 10% less SPs, even if it was a die shrink it would perform 10% better just with thoses parameters.
Then Tonga, wich is surely not as advanced as Polaris, display 10-14% better efficency/Hz than Tahiti, that makes how much..?..
Add 20% frequency above the stock 1.26GHz, that s what, 1.1 x 1.1 x 1.2 = 1.45x the perf of a 390 clocked at 1.05GHz.
As for perf/watt there s enough of it at stock, it s not 20% higher frequency that will change the pic, that s 2.33x rather than the stated 2.8x...