Calling it the most “forward-looking” iPhone it’s ever launched, Apple equipped the iPhone 5S to run 64-bit apps (all previous models ran at 32 bits) thanks to a new processor: the Apple A7. It packs more than 1 billion transistors into a 102mm chip. Apple has re-engineered all the built-in apps — such as Mail, Calendar and iPod — for 64-bit architectures.
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