The number of cores and transistors on a chip varies.
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The main difference between the m2 chip and the a13 chip is the number of cores and the number of transistors. The m2 chip cpu core uses an 8-core design, and the gpu also comes in 10-core and 8-core versions. The a13CPU uses a 6-core design and the GPU uses a 4-core design. The m2 chip has 20 billion transistors, and the a13 chip has 118 transistors.