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[* black] Here are two side X-rays of the A4 processor.
[* black] The dark dots along the inside of the processor are solder balls connecting the dies together. These are known as [link|http://en.wikipedia.org/wiki/Ball_grid_array|Ball Grid Arrays] (or BGA's) in the industry.
[* black] These pictures are shot at two focal points across the width of the processor. They were quick shots, so we apologize if they're a little fuzzy.
[* black] The DRAM in A4 is made by Samsung, so wirebonds are coming from both sides—unlike DRAM from some other manufacturers.