The good folks at iFixithave partnered up with the reverse-engineering gurus at Chipworks to give us an inside view of Apple’s A4 processors as used in the iPad.
We now get to see Apple’s A4 CPU, X-rayed and uncovered.
Image courtesy of iFixit/Chipworks
There are some interesting highlights uncovered from this investigation:
The A4 package is composed of three layers: two layers of RAM (Samsung K4X1G323PE), and one layer containing the actual microprocessor.
This Package-on-Package construction allows Apple to source the RAM from any manufacturer they want. While Apple is sourcing the RAM from Samsung now, this could be changed.
The A4 processor is a single-core CPU, making it either an ARM Cortex A8 or a single-core variant of the A9. Most likely, it’s an A8.
http://blogs.zdnet.com/hardware/?p=7928&tag=content;col1
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