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.
I suppose you mean "CPU" The system bus is typically set at a vastly lower frequency than the CPU. They handle different things, so comparing them to each other for "speed" isn't really possible. This is similar to asking if the speed of a plane is higher than the hardness of a rock.
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
System Bus or Front side bus
The front side bus formerly connected the Northbridge Controller to the CPU (a way of communication) it still has the same communication, but it is not called FSB, it is called a HyperTransport Bus.