I have flashed my RX480 BIOS , copying the 1750 value to the 2000 value. I am running Win 7, 64 bit, and the AMD 17.2 drivers (or close to that). I only went from 18MH/s to 19MH/s. I have increased my memory speed to 2250 in Wattman . Is there any other Wattman settings to change (freq volt, etc) to get 25MH/s ? I don't understand why my speeds are so low. The cards have Samsung memory too..