微軟網站有些資料........
http://www.microsoft.com/technet/tr...dc_mcc_vxjo.asp

複製一段：
Windows XP Professional provides native support for processor performance control technologies such as Intel® SpeedStep® Technology, AMD® PowerNow!™, and Transmeta® LongRun™. Windows XP Professional also features an adaptive processor performance control algorithm that dynamically balances system performance and power consumption, based on the current CPU workload and remaining battery life.

這裡有說明如何觀看變頻技術CPU的時脈：
http://support.microsoft.com/defaul...ben-us%3b316965

試了一下，拔掉電源線後用它的方法[控制台->系統內容/附屬應用程式->系統資訊]，顯示的時脈都是未拔市電時的1.6G，這時用Sandra2003看顯示為變頻技術啟動該有的1.2G，接回市電WindowsXP自己顯示的沒變，Sandra2003變為1.6G........看起來XP無法讀出變頻技術啟動的正確時脈，要看時脈還是用其他工具程式吧，我的是WindowsXP Home SP1