On modern systems, the CPU.
*Very* old systems (Apple II, "IBM" PC) use the same CPU and bus speeds.
CPU operates from 166 MHz to more than 3 GHz system can operate from 133 MHz to 400 MHz. CPU is faster than the system bus
The system bus is usually inside of the CPU, but I guess it depends on the processor and the motherboard. Usually, CPU clock speeds are faster, as they are measured in GHz, while the system bus speed is usually measured in MHz. Hope this helped! SeanHolshouser
Your data busses sends information from component to component i.e. your FSB (front side bus)/system bus/internal bus communicates between your CPU and RAM, the faster it runs, the faster information is moved between your RAM and CPU giving your CPU quicker access to that data.
CPU is faster then the system bus Information is sent to and from the CPU, RAM, DIsk Controllers, Etc. on the System Bus. It is the 'Inter-Office Communication Channel' of your Computer. In some cases, where the System Bus is too slow, faster CPU's must idle between tasks while waiting for communications from other parts of the machine.
System bus
The Front Side Bus (FSB) connects the processor (CPU) in your computer to the system memory.
The bus that connects the CPU to main memory on the motherboard. I/O buses, which connect the CPU with the systems other components, branch off of the system bus."The system bus is called the frontside bus, memory bus, local bus, or host bus."See the Related Links below.
A system bus frequency is 1600 MHz. A CPU frequency is 166 MHz to almost 4GHz.
An expansion bus will not work in sync with the CPU. In addition, it will not work with the system clock.
System Bus
FSB (Front Side Bus) is also known as the Memory BUS or System BUS and connects the CPU with the main memory and is used to connect to other components within the computer. The FSB can range from speeds of 66MHz, 100MHz, 133MHz, 266 MHz, 400MHz, 533MHz and beyond. System bus: The bus that connects the CPU to main memory on the motherboard. I/O buses, which connect the CPU with the systems other components, branch off of the system bus. Backside bus: A microprocessor bus that connects the CPU to a Level 2 cache. Typically, a backside bus runs at a faster clock speed than the frontside bus that connects the CPU to main memory. For example, the Pentium Pro microprocessor actually consists of two chips -- one contains the CPU and the primary cache, and the second contains the secondary cache. A backside bus connects the two chips at the same clock rate as the CPU itself (at least 200 MHz). In contrast, the frontside bus runs at only a fraction of the CPU clock speed.
System Bus or Front side bus