AMD's 300 series graphics cards have arrived, ahead of the flagship Fury cards. Unlike the Fury lineup, the 300 series all use existing GPUs. So what has AMD done to differentiate the new from the old? br NOTE: The cards are labeled inaccurately on the spec sheet: "R9 380X" and "R9 370X" should actually be "R9 380" and "R7 370", respectively.