Probably in 2014, the most representative product of Apple's A8 processor in the world is Apple 6, with excellent performance, with the ios system and Apple's optimization plan, so at that time, Apple 6 was hardly matched with the new generation of A8 chip compared with A7 chip CPU performance increased by 25%, graphics performance increased by 50%. And because the 20nm process is used, the performance is also better than before. Official data show that the battery life performance of both iPhone 6 models has improved over the previous generation