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The big deal here is undoubtedly the display. While some may argue it is not truly a Retina Display, since it sports a 264ppi pixel density, as opposed to the 326ppi on the last two iPhones, let's not forget that one variable to call it Retina is set to be the distance from your eyes, and your tablet is usually further away than your phone.
Now comes the A5X chip. The A5 silicon in the iPad 2 and iPhone 4S is plenty powerful for any app you throw at it, with its dual-core CPU based on ARM's Cortex-A9 architecture. Cortex-A15 gadgets are yet to arrive at some point this year, but the "X" mark after A5 still must denote some sort of an improvement, right? The move from the A4 system-on-a-chip (SoC) in the iPhone 4 to the A5 SOC was denoted by a bump in the processor codes used by Apple. The A4 is S5L8930X, while the A5 is S5L8940X. Now the A5X label goes 5 digits further to S5L8945X, indicating only a partial upgrade over the A5.
Well, those 3 million pixels are not going to light themselves if we don't have more graphics prowess in the chipset, so Apple has bumped the GPU to a quad-core one now. Before you smile condescendingly knowing that Tegra 3 has a 12-core GPU, and even Tegra 2 has an 8-core one, let's remember that we are talking PowerVR when it comes to the iPad.
The A5 has a dual-core PowerVR SGX543MP2 graphics subsystem, which wipes the floor with the
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