I told you today that in iPad Air we find the same face A7 as in iPhone 5S, and in the image above you can see how it differs from the A6X chip implemented in iPad 4. Produced using a 28nm manufacturing process, the new chip has much better performance and consumes less power than the chip released last year by Apple Lossless Audio CODEC (ALAC),, but keeps the same cache of the processor, although it uses DDR3 RAM much faster. So far it has been demonstrated that this chip is the fastest on the market, but his performances they are not constant in the case of long-term use at "maximum frequency".
Tested using applications that force processors to work at maximum speed, it was discovered that iPhone 5S reduces its processing speed from 1.3 GHz to 900 MHz after 2 minutes of intensive use, while the tablet iPad Air it reduces its frequency from 1.4 GHz to 1.2 GHz, but at a slower pace. Practical performance iPhone 5S will be significantly reduced after forcing the processors to run at maximum frequency for 2 minutes, while in the case of the iPad tablet the same thing will not happen. The system implemented by Apple was designed with the idea of not using all the battery energy at once in applications that consume a lot of resources, so the frequency of the processor is reduced to a value that only allows applications to run in optimal conditions.
You can see the 5s throttles back its CPU frequency to about 1GHz after the 2 minute mark. The crazy thing is that until that point the 5s manages to run at full frequency without so much as a hiccup for two full minutes, running an incredibly power hungry task. The iPad Air by comparison shows much more controlled behavior. Early on in the test we see a 7.7% performance advantage, which lines up perfectly with the iPad Air's 7.7% CPU frequency advantage. By the end of the test the iPhone 5s has throttled to 900MHz, while the iPad Air drops to around 1.2GHz.
Although it is not known if the same thing happens in the case of the graphic processor, there are chances that Apple will apply a similar system, especially for games, which consume extremely many resources. In conclusion, the iPhone 5S performs well, but only for two minutes, after which it runs at a frequency similar to that of the iPhone 4S. Even if the frequency is similar and we are still talking about two cores for the processor, the difference between the architecture of the processors offers a great performance boost for the iPhone 5S.
