CPU的主频表示在CPU内数字脉冲信号震荡的速度，主频和实际的运算速度存在一定的关系。
直至最近，这种状况都是靠提高时钟频率达到的，在我有生之年，我已看到处理器主频从几千赫兹上升至几吉赫兹。
Up until recently, this was accomplished by accelerating the clock speed, which has leaped from kilohertz to gigahertz in my lifetime.
其次，指令发射逻辑是超标量处理器中的关键路径，也是制约执行单元为超标量结构的多线程处理器主频提高的关键因素。
Secondly, the issue logic is not only the critical path in a superscalar microprocessor, but also critical to the performance of a multithreaded microprocessor with superscalar execution core.
这台老式笔记本生产于2008年，处理器是英特尔酷睿2双核t 7500，主频2.2 GHz，内存2gb。
This 2008-vintage notebook is powered by a 2.2ghz Intel Core 2 Duo processor T7500 and has 2gbs of RAM.
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