[SOLVED] What,s the difference between front Side bus and system bus

[MMedo]

The System Bus contain on Data bus and address bus and control Bus .is this front Side bus the same System Bus . is this System Bus Or Fsb used to transfer data between North bridge and south bridge to cpu?

 

[Eximo]

Well a lot of the specific terms are going to depend on the CPU architecture you are referring to.

In general I would say the system bus is a generic term that covers the function of communication between major components and the front side bus is a more specific term for older CPUs. I don't think contemporary hardware refers to a front side bus, but rather a base clock frequency that sets the timing for all buses in the system. Given that the concept of a northbridge disappeared a long time ago, almost everything became integrated directly on the CPU die. Only relevant thing coming out of the CPU is typically a PCIe bus and DMI these days. Closest equivalent to FSB in a modern Intel chip might be the system agent. AMD, probably the infinity fabric (which was just rebranded again)

FSB is exclusively CPU to memory controller (northbridge). Data bus to the south bridge and to the rest of the system.

Really I would say it comes down to semantics.

 

[hotaru.hino]

"System bus" is typically the main communication system that connects the CPU, I/O, and memory. What this is depends on the computer system. In older computer system designs, the Front-side bus is the system bus. In modern times, on AMD systems, the Infinity Fabric is considered the system bus. On Intel's systems, it's the System Agent. While there is something called the Direct Media Interface or DMI, it's really a part of the I/O communication system.

 

[MMedo]

Well a lot of the specific terms are going to depend on the CPU architecture you are referring to.

In general I would say the system bus is a generic term that covers the function of communication between major components and the front side bus is a more specific term for older CPUs. I don't think contemporary hardware refers to a front side bus, but rather a base clock frequency that sets the timing for all buses in the system. Given that the concept of a northbridge disappeared a long time ago, almost everything became integrated directly on the CPU die. Only relevant thing coming out of the CPU is typically a PCIe bus and DMI these days. Closest equivalent to FSB in a modern Intel chip might be the system agent. AMD, probably the infinity fabric (which was just rebranded again)

FSB is exclusively CPU to memory controller (northbridge). Data bus to the south bridge and to the rest of the system.

Really I would say it comes down to semantics.

Thank you I have question I know memory controller and graphics card controller inside CPU so are the cpu need any buses to access to Ram and graphics to get data? . modern Computer have Platform controller hub chip the cpu use Dmi to communication with Pch so Dmi is important to Cpu to communication with Ram and graphics ?sorry for bad grammar thank you

 

[MMedo]

"System bus" is typically the main communication system that connects the CPU, I/O, and memory. What this is depends on the computer system. In older computer system designs, the Front-side bus is the system bus. In modern times, on AMD systems, the Infinity Fabric is considered the system bus. On Intel's systems, it's the System Agent. While there is something called the Direct Media Interface or DMI, it's really a part of the I/O communication system.

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