The big draw for the iPhone 5S is probably under the hood. At the heart of every iPhone 5s beats a 64-bit A7 A7 system-on-a-chip (SOC), complete with the new M7 motion processor, make it the most powerful of the bunch. SOC is a term for a central processing unit (CPU), graphics processing unit (GPU), and other components like random-access memory (RAM) spun together into a single, integrated chip.
The Apple A7 is twice as fast at both general purpose and graphics processing as its predecessor, the Apple A6, yet remains roughly the same size. The bigger news is that the Apple A7 is 64-bit, and the first 64-bit processor crafted for a consumer smartphone, and that it supports OpenGL ES 3.0, and comes with a companion chip, the M7 motion coprocessor.
Even more impressive, A7 makes iPhone 5s the first 64-bit smartphone in the world — that's desktop-class architecture in a superslim phone. And because iOS 7 was built specifically for 64-bit, it's uniquely designed to take advantage of the A7 chip. iOS 7 and all the built-in apps are optimized for the A7 chip. The Camera app is a great example. It takes advantage of a new image signal processor built into A7 to give you up to 2x faster autofocus, faster photo capture, and higher video frame rates.
The iPhone 4S comes with A5 processor which is twice as fast the processor in the iPhone 4.
