Much of Apple's secret sauce for the iPad2 is either in its software or its system-on-chip processor—the A5. We can't do a teardown exposing the code, unfortunately, but we can explore the A5.
“The primary observation is that the A5 is huge, with a processor die size of 12.1 x 10.1 mm," said Robert Widenhofer, a senior technical analyst at UBM TechInsights.
"You'll recall that the A4 was a package-on-package with the processor and its supporting memory stacked one capsule atop another, and it had a processor die size of 7.3mm x 7.3mm," Widenhofer said.
"For the A5, we see a single package containing the processor die and a pair of 256 MByte low power DDR2 SDRAM die--512 MBytes total memory, likely configured to support a 64-bit bus,” he said.
The initial markings and location of the markings on the A5 suggest it may be fabricated by Samsung. However, UBM TechInsights is continuing its analysis of the chip in greater detail. Stay tuned for more detail.
Meanwhile, below is a chart comparing the A5 to past Apple SoCs.
Click on image to enlarge.
1. Qualcomm beats back Infineon
2. Estimated iPad2 BoM: $270
3. Inside the A5 microprocessor