https://blog.wongcw.com/2019/01/07/nvidia%e7%82%ba%e6%89%80%e6%9c%89freesync%e9%a1%af%e7%a4%ba%e5%99%a8%e8%a7%a3%e7%a6%81%e6%94%af%e6%8c%81g-sync/