Below diagram gives an overall idea of different processors Apple has released till date
Before A4 series, there did not exist a naming convention like AX, the Apple iPhone 3Gs, iPod Nano, earlier versions of iPod Touch devices had chips APL0098, APL0278, APL0298, APL2298 etc.
A4 was introduced in iPad 1st gen, iPhone 4, iPod Touch (4th gen) Apple TV, iPad 2, iPhone 4S
A5 was introduced in Apple TV 3rd Gen, iPad 2, iPod Touch, iPad Mini , Apple TV 3
A5X was introduced in iPad 3 devices
A6 was introduced in iPhone 5 and iPhone 5C
A6X was introduced in iPad 4th Gen
A7 was introdueced in iPhone 5S, iPad mini 2, iPad mini3, iPAd Air
A8 was introduced in iPhone 6, iPhone 6 Plus
A8X was introduced in iPad Air 2
S1 is getting introduced in Apple Watch
A7 processor is a 64 bit processor. It is faster than A5 in terms of CPU performance and 8 times faster than A5 in terms of GPU performance.
A7 also got image signal processor, Secure Enclave for storing and processing the Tocuh fingerprint data, in addition, it has Motion sensing, Gyroscope.
M7 Chip is a co-processor, which can help chips such as A7 from overheating because it has to do lot of processing since it is 64 bit architecture. M7 especially is a motion sensor processor.
References
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