System Bus Speeds and FSB Speeds?

[Beno]

Hey Every1,

What I want to know is what is the difference between frontside bus speeds and system bus speeds and why are there different speeds.

Does this mean as data passes through the system it does so but keeps changing its speed depending on what data bus it is on??

Cheers

Beno

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Have a nice day

[diurnal]

ok im kinda out of date, so yall check me if i wrong.As im sure you will.
FSB is what the cpu will go up to ex. 200fsb, and 266fsb.
Your system bus speed is your ram speed which is rated at 133mhz and or your pci bus speed which runs at 33mhz.
They are different i guess is if you want to upgrade to a 266 Ram bus speed or DDR ram, youll have a processer that will go up to that speed. So its rated higher so you can have future upgradees without replacing the processer. However i kinda think AMD wants you to buy a new processer everytime you upgrade, so they probably rate the speed so high cause of marketing or something. And you run at what your motherboard will run , meaning 133mhz so you really dont run at 266, so you are hinder by your motherboard. Ok i hope thats clear. But its probably not. Im not teacher,so im not good at explaining to much. http://www.PCGuide.com/ubb/biggrin.gif

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Sledgehammer will save the day!

[JadedC36]

Well, I always thought that the 'System Bus' was the same as the Front Side Bus, and the other busses eminating from the 'North Bridge' were the AGP, which should run at 66Mhz, the PCI bus, which should run at 33Mhz, and the Memory Bus, which can run at 66, 100, 133 (on some, but not all motherboards), depending on the memory installed, and/or the FSB speed. It seems that some of the newer chipsets, can run a FSB at 133, and the memory bus can run at 100. This, of course, would not be the optimum for that configuration, but could be done. And regardless of the chipset/CPU, the bus speeds are still 100, or 133Mhz, for the FSB, and memory, and that 200, 266, 400, etc. are just the data rates, or the effective speed of the FSB/memory busses. In other words, a FSB speed of 266Mhz is an actual 133Mhz clock speed, but the circuitry can send data on the rise, and fall of the clock frequency for "Double Data Rate", and the CPU can handle data at this rate. Please feel free to make corrections, if this is of importance to anyone.

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Mike