刚才浏览cpu，发现一个问题。无论是i7还是i5，很多cpu都标配着：
总线频率 5.0GT/s
那么问题就来了。
以Intel 酷睿i5 4590和Intel 酷睿i7 4790K为例子。
这两款cpu无论从价格还是参数上来说，都不是同一级别的。但是他们都是相同的总线频率。
我特意查询了总线频率，intel官方网站是这样介绍的：
Front-Side Bus (FSB) is an interface between microprocessor core and other computer components, such as memory, peripheral devices and other microprocessors. FSB is often called a "system bus". Microprocessor performance highly depends on the speed, width and latency of the system bus:
Wider system bus allows the CPU to transfer more data during each bus cycle.
Faster system bus allows the CPU to transfer data faster from/to memory or peripheral devices.
Please note that buses of many modern microprocessors utilize dual-data and quad-data rate transfers, which effectively doubles and quadruples bus speed. For instance, the bus of first Pentium 4 microprocessors was clocked at 100 MHz. Because the data could be sent 4 times during each bus cycle, the bus effectively worked as 400 MHz bus.
大概就是说这是cpu和外界数据交换通道，决定整台电脑的性能。
那么问题来了。既然cpu和外界数据交换是有带宽限制的，那么上面两款cpu价格差异那么大，参数差异也那么大（最明显的是核心数和线程数的差异），那i7拿那么多核心来有什么用？一旦传输的数据达到了总线频率的上限，i5和i7岂不都一样？
总线频率 5.0GT/s
那么问题就来了。
以Intel 酷睿i5 4590和Intel 酷睿i7 4790K为例子。
这两款cpu无论从价格还是参数上来说，都不是同一级别的。但是他们都是相同的总线频率。
我特意查询了总线频率，intel官方网站是这样介绍的：
Front-Side Bus (FSB) is an interface between microprocessor core and other computer components, such as memory, peripheral devices and other microprocessors. FSB is often called a "system bus". Microprocessor performance highly depends on the speed, width and latency of the system bus:
Wider system bus allows the CPU to transfer more data during each bus cycle.
Faster system bus allows the CPU to transfer data faster from/to memory or peripheral devices.
Please note that buses of many modern microprocessors utilize dual-data and quad-data rate transfers, which effectively doubles and quadruples bus speed. For instance, the bus of first Pentium 4 microprocessors was clocked at 100 MHz. Because the data could be sent 4 times during each bus cycle, the bus effectively worked as 400 MHz bus.
大概就是说这是cpu和外界数据交换通道，决定整台电脑的性能。
那么问题来了。既然cpu和外界数据交换是有带宽限制的，那么上面两款cpu价格差异那么大，参数差异也那么大（最明显的是核心数和线程数的差异），那i7拿那么多核心来有什么用？一旦传输的数据达到了总线频率的上限，i5和i7岂不都一样？
