Honestly im thinking we have got all what we need for rx series. Just bkz of 256 bit band. Any empruvement is only cards with 386 bit ram band.
I agree with that. The R9 390 has 512 memory bit, so it is faster.
May be. Nvidia 1070 has much less cores (1920) and Memory Bandwidth (GB / sec) 256 but fast hashed than R9 390X,R9 390 and RX480. My EVGA nVIDIA GTX 1070 hashed 430 sol/s .