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The Front Side Bus (FSB) connects the CPU with the computer's memory. The faster this bus is, the faster the CPU communicates with the system. As an example, AthlonXP processors have a 133MHz FSB. AthlonXP 2700+'s and higher have a 166MHz FSB. Often the BIOS sets the FSB to 100 MHz to prevent damage to the processor. Nearly all new processors run on a 133 MHz bus (100 MHz, for some older Pentium 4's and 166 MHz for newer Athlon XP's) so you must configure your BIOS to run the processor on a 133 MHz bus (or higher).

For example:

Say you have a 2 GHz Pentium 4 that is designed to be run on a 133 MHz bus, but it is only being run at 100 MHz. The clock speed of the processor is determined by multiplying the FSB by the multiplier (each processor has a multiplier that cannot be changed and determines the speed of the chip)

Incorrect:100 MHz (FSB) x 15 (Multiplier) = 1500 MHz
Correct: 133 MHz (FSB) x 15 (Multiplier) = 2000 MHz
500 MHz is a pretty significant loss of crunching power and you do not want to make that mistake.


Overclocking is running the FSB higher than what the processor is engineered to run at. If you have a processor that is designed to run at 133 MHz and you have the FSB set anything above that, the processor will be overclocked. Generally overclocking by modest amounts is safe provided that you have good cooling.

Disclaimer: Overclocking will void your warranties and can damage your processor if the proper precautions are not taken.

More discussion on this topic here: »www.pcstats.com/articleview.cfm?···eID=1352

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by slash See Profile edited by KeysCapt See Profile
last modified: 2008-01-28 08:43:46