CPU的频率有主频、倍频和外频。某处理器外频是200 MHz，倍频是13，该款处理器的主频是（ ）。
- A.2.6 GHz
- B.1300 MHz
- C.15.38 MHz
- D.200 MHz
正确答案及解析
正确答案
解析
CPU的工作频率（主频）= 外频倍频。外频就是外部频率，指的是系统总线频率。倍频的全称是“倍频系数”，是指CPU主频与外频之间的相对比例关系。最初CPU主频和系统总线速度是一样的，但CPU的速度越来越快，倍频技术也就相应产生。它的作用是使系统总线工作在相对较低的频率上，而CPU速度可以通过倍频来提升。本题中外频200 MHz，倍频13，所以主频=200 MHz13=2.6 GHz。
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