https://blog.wongcw.com/2019/09/11/%e5%82%b3%e5%90%88%e8%82%a5%e9%95%b7%e9%91%ab%e5%b9%b4%e5%ba%95%e9%87%8f%e7%94%a2ddr4%e5%85%a7%e5%ad%98%ef%bc%9a19nm%e5%b7%a5%e8%97%9d%e3%80%818gb%e6%a0%b8%e5%bf%83/