Never seen good results with ASUS. Their STRIX RX470's are very unstable when OCing memory over 1925 usually, while other (like MSI Gaming or Saphire) with same memory (Hynix) are Ok at 1950 and 1975 (same straps used, voltages etc).
Have no idea how to reach better perfomance with STRIX models and not loose stability. I tested about 6 or 7 STRIX and all have similar problems described above. For me STRIX are the worst mining cards
yes it seems Asus GPUs not the best,I have 1070 Asus and Gigabyte both of them with Micron memory;Asus gives 440 sol/ 30 Mh,Gigabyte 480 sol 32Mh