https://blog.wongcw.com/2022/07/07/%e5%b9%b4%e5%85%a7%e5%b7%b2%e8%b7%8c30-dram%e5%85%a7%e5%ad%98%e8%a6%81%e7%b9%bc%e7%ba%8c%e6%9a%b4%e9%99%8d%e5%ba%ab%e5%ad%98%e5%a0%86%e7%a9%8d%e5%a6%82%e5%b1%b1/