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The Raspberry PI 4 uses a Quad-core ARM Cortex A72 processor while the Raspberry PI 3+ uses a Quad-core Cortex A53 processor. The A72 processor is a newer version (2016) of the ARMv8-A architecture than the A53 (2012).
The A72 uses out-of-order and speculative execution and other improvements to achieve better performance than the A53.
This is analogous ...
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