The iPhone has gone through seven iterations since its launch in 2007, some more drastic than others. There have been software updates, hardware redesigns, a screen expansion, and countless other changes that have altered everything about Apple's smartphone. During the iPhone 5s and 5c event in September, as with every iPhone unveiling, Apple talked a big game in regards to the numbers. In fact, the iPhone 5s CPU is supposedly 40x faster than the first-generation iPhone — but how do vague numbers like this actually affect the speed of the phone?
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Video: iPhone speed test shows iPhone 5s isn’t always fastest