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<Original Answer> because some devices on the board are slower than others and do not require or cannot support the same bus speeds.

<Update> The book that this question comes from has another answer: that it is required for backwards compatibility. This is the answer for the test, but, I do not like it.

My answer is that having a high speed bus to some devices is a waste of CPU effort that could be better used on RAM or other high-speed items. There is not point to putting a modem or printer on a high speed bus that the CPU has to monitor only to find out that the printer or modem is done with the last burst of data sent.

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