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Ensure Optimal Bus Speed Settings
On a modern system, the speed of the processor is a function of the system bus (memory bus) speed, and the clock multiplier used to determine the ratio of the system bus speed and the processor speed. So a Pentium Pro 200 runs at 200 MHz on a 66 MHz system bus, using a 3x multiplier; 3x66 is 200 (66 is really 66.6666...)
In some cases, there is more than one way to generate the correct bus speed for a particular processor speed. If you have a processor running at this speed, you want to make sure that you use the fastest bus speed supported by the motherboard/chipset. There aren't many processors for which this is an issue, but for a few of them it is:
Note: Exceeding either the
rated system bus speed of the motherboard/chipset, or the rated speed of the processor is
considered overclocking. For example, the Pentium 166 is
designed to be run at 2.5x66 MHz; you could run it at 2x83 MHz if your motherboard
supported it, but in this case the chipset is overclocked unless it supports 83 MHz
operation, and expansion cards and peripherals may be overclocked as well.