for devoleper:  
Sapphire RX570 8GB, cca -1.5Mhs less, cant get 30.5+ like in Claymore 11.2, RX470 works good, but less, same frekvenci.
PhoenixMiner 2.7c
http://shrani.si/f/2u/j2/2Hfg6cb9/phoenixminer.png
claymore 11.2
http://shrani.si/f/X/N/2xxE6jlc/clay.png