Qualcomm Snapdragon 821 was one of the most energy-efficient mobile chips available in the market compared to the Apple A9 .
Apple stated that it had 70 % more CPU performance and 90 % more graphics performance compared to its predecessor , the Apple A8 , and was one of the most powerful and energy-efficient mobile chips on the market then along with the Samsung Exynos 8890 and Qualcomm Snapdragon 821.
Apple A9