https://qooah.com/2012/04/19/%e8%b6%85%e5%bc%b7-2ghz-cortex-a15-%e5%9b%9b%e6%a0%b8%e5%bf%83%e8%99%95%e7%90%86%e5%99%a8%e7%99%bb%e5%a0%b4%ef%bc%8c%e6%95%88%e8%83%bd%e5%aa%b2%e7%be%8e%e9%9b%bb%e8%85%a6%ef%bc%81/