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

claymore 11.2

bruh. gotta let it more than a couple seconds to make that kind of determination... damn.
run it 3-5 days on each one, and compare the number of accepted shares from each one in the same time frame.
i ran my own test, exactly 60hrs on each one. Phoenix submitted more shares than claymore v10 (havent tried 11.2). that's all that matters.