https://blog.wongcw.com/2019/10/21/sk%e6%b5%b7%e5%8a%9b%e5%a3%ab%e5%ae%a3%e5%b8%83%e6%98%8e%e5%b9%b4%e9%87%8f%e7%94%a21znm-16gb-ddr4-dram/