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Real PCI Clock Rates

The PCI spec allows for clock rates up to the max specified (either
33MHz or 66MHz, depending upon mode.)  I'm wondering whether I should
expect to see less than 33MHz in actual practice.  I'm interested in not
only Wintel boxes but also Sun and Mac.  Same question for the 66MHz
bus:  Might I expect a 50 or 55 or 60MHz PCI clock when operating in
66MHz mode?