笔记本第二个m.2硬盘位会降速吗？

买了个光威弈pro 1T的硬盘，做从盘。(宣传上是3k的读写)
用了一个多月，感觉有点不太对，于是测试了一下。
几个软件上都是1k左右写入，将近3k读取(温度就四十多度)。然后去问了客服，说是从盘会降速。但是就算是走南桥这数据也有点离谱啊。所以前来问问到底是什么情况。
ps：只有aida64里面buffered read是将近3k，random read就是将近1k
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笔记本是荣耀猎人v700