https://qooah.com/2015/04/27/%e8%81%af%e6%83%b3%e4%bd%8e%e8%aa%bf%e7%99%bc%e4%bd%88-64bit-intel-%e8%99%95%e7%90%86%e5%99%a8%e6%96%b0%e6%99%ba%e8%83%bd%e6%89%8b%e6%a9%9f/