FSB频率

FSB频率（即总线频率）直接影响CPU和内存之间直接数据交换的速度。有一个可以计算的公式，即数据带宽=（总线频率×数据位宽度） / 8，数据传输的最大带宽取决于所有同时传输数据的宽度和传输频率。例如，当前支持64位的Xeon Nocona的前侧巴士为800MHz。根据该公式，其数据传输的最大带宽为6.4GB / sec。

FSB和FSB频率之间的差异：FSB速度是指数据传输速度，而FSB是CPU和主板同步运行的速度。换句话说，100MHz FSB是指数字脉冲信号每秒振荡100亿次。100MHz FSB是指CPU每秒可接受的数据传输速率为100MHz×64bit÷8bit / byte = 800MB / s。

实际上，随着“大型传输”体系结构的出现，这种实用的前侧总线（FSB）频率已经改变。The IA-32 architecture must have three important components: Memory Controller Hub (MCH), I / O Controller Hub and PCI Hub, like Intel ’s typical chipset Intel 7501. Intel7505 chipset, which is a dual Xeon processor Custom-made, they contain MCH to provide the CPU with a front-side bus frequency of 533MHz, with DDR memory, the front-side bus bandwidth can reach 4.3GB / sec. However, with the continuous improvement of processor performance, it also brings many problems to the system architecture. The "HyperTransport" architecture not only solves the problem, but also improves the bus bandwidth more effectively. For example, the AMD Opteron processor and the flexible HyperTransport I / O bus architecture allow it to integrate a memory controller so that the processor does not pass through the system bus. Exchange data directly with the memory for the chipset. In this case, the front-side bus (FSB) frequency is not known from AMD Opteron processors.