Contrary to what was expected from the Apple A4 in the first information raised after the launch of the iPad, the Ars Technica claims that the chip based on the same edition of the existing ARM architecture in iPhones / iPods touch, the Cortex A8. The site cites reliable (but anonymous) sources in its component analysis, but considering that the chip has an operating frequency of 1GHz, it was expected to be a variant of an ARM processor with two cores, based on the Cortex A9 architecture , launched in the middle of last year.
In addition, even though the main members of the PA Semi engineering class are outside Apple, the story also suggests that some technical expertise from the company was used to provide the A4 with greater energy efficiency, which would justify the ten-hour battery life. the iPad. However, making a simple account and without relying on details, it is concluded that the chip is only 67% faster than an iPhone 3GS processor, a considerable difference, but that it should be much greater for a tablet and for the types of applications that it can run.
If the information collected by theArs are correct, and Apple is likely exploring software optimization techniques that are much more advanced for ARM architecture than before, with a view to speeding up the iPad's operating system and applications as much as possible. The article also suggests that the company would be taking advantage of processing resources by dispensing with other components, such as image sensors for a camera, for example.
Recently, it has also become clear from Apple's own documentation that the A4 uses integrated graphics technology similar to that of iPhones and iPods touch, but that it is probably much more efficient to take advantage of high resolution and advanced 3D graphics.