A front-side bus (FSB) is a communication interface (bus) often used in computers manufactured in the 1990s and 2000s. It carries data between the central processing unit (CPU) and the Northbridge.
The frequency at which a processor (CPU) operates is determined by applying a clock multiplier to the front-side bus (FSB) speed. For example CPU which is set to run at 8 times(multiplier) the frequency of the front-side bus has a clock speed of : 400 MHz × 8 = 3200 MHz. Often system performance depends on the FSB clock speed. A slow FSB can cause the CPU to spend more amount of time waiting for data to be fetched from system memory.
Advantages of front-side bus are high flexibility and low cost. The front-side bus was criticized by AMD as an old and slow technology which limits system performance.
Most modern processors use point-to-point connections like AMD's HyperTransport and Intel's QuickPath Interconnect (QPI). In HT- and QPI-based processors, the memory is accessed independently by using a memory controller integrated into the CPU chip itself, freeing bandwidth on the HyperTransport or QPI link for other purposes.
The frequency at which a processor (CPU) operates is determined by applying a clock multiplier to the front-side bus (FSB) speed. For example CPU which is set to run at 8 times(multiplier) the frequency of the front-side bus has a clock speed of : 400 MHz × 8 = 3200 MHz. Often system performance depends on the FSB clock speed. A slow FSB can cause the CPU to spend more amount of time waiting for data to be fetched from system memory.
Advantages of front-side bus are high flexibility and low cost. The front-side bus was criticized by AMD as an old and slow technology which limits system performance.
Most modern processors use point-to-point connections like AMD's HyperTransport and Intel's QuickPath Interconnect (QPI). In HT- and QPI-based processors, the memory is accessed independently by using a memory controller integrated into the CPU chip itself, freeing bandwidth on the HyperTransport or QPI link for other purposes.
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