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System on a Chip: A8
The A7's 64-bit architecture as introduced with the iPhone 5s and the iPad Air was a real shocker, and it leads us to beleive that Apple is heading down a path of platform convergence with their computing products.
However, with Apple facing a lot of competition now from Samsung's home-grown high-performance Exynos 5 processor used in the Nexus 10 and the Galaxy S 4 smartphone, we're likely to even more disruptive improvements in Apple's own silicon with the introduction of the A8.
While the use of a Quad-core SoC design in the iPad Air 2 is likely, we may very well see the A8 conceived as a "hybridized" chip using custom silicon, which might utilize a combination of two higher-clocked 64-bit cores and two or more smaller, lower-power and slower 64-bit cores, so that applications will run on a "cluster" of cores best suited to their workload, thus making the SoC more energy-efficient.
This hybrid core technology, known as big.LITTLE and licensed by ARM Holdings, could very well make it's way into the A8 in the iPad Air 2 and iPhone 6. Samsung has already announced its own big.LITTLE chip in the form of the Exynos Octa which is used in some international carrier (GSM) versions of the Galaxy S 4.
It also goes without saying that we are also likely to see a 2x or more boost in GPU processor power over the A7, increasingly moving the needle closer to the capabilities of their PC and console counterparts and enabling the most demanding games on tablet hardware. An 8-core GPU design using PowerVR Series 6 technology is not out of the question.